History Patterns

Jazz's automatic history tracking enables powerful patterns for building collaborative features. Here's how to implement common history-based functionality.

Audit Logs

Build a complete audit trail showing all changes to your data:

function 
function getAuditLog(task: Task): {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
getAuditLog(
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task: 
type Task = {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
Task) {
  const const changes: any[]changes = [];

  // Collect edits for all fields
  const const fields: string[]fields = var Object: ObjectConstructor
Provides functionality common to all JavaScript objects.
Object.ObjectConstructor.keys(o: {}): string[] (+1 overload)
Returns the names of the enumerable string properties and methods of an object.
@paramo Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
keys(
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task);
  const 
const edits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits = 
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task.
CoMap.$jazz: CoMapJazzApi<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Jazz methods for CoMaps are inside this property.

This allows CoMaps to be used as plain objects while still having
access to Jazz methods, and also doesn't limit which key names can be
used inside CoMaps.
$jazz.
CoMapJazzApi<{ readonly title: string; readonly status: "todo" | "in-progress" | "completed"; } & CoMap>.getEdits(): CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Get the edits made to the CoMap.
@categoryCollaboration
getEdits();
  for (const const field: stringfield of const fields: string[]fields) {
    const const editField: "title" | "status"editField = const field: stringfield as keyof typeof 
const edits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits;
    if (!
const edits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits[const editField: "title" | "status"editField]) continue;

    for (const const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit of 
const edits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits[const editField: "title" | "status"editField].all: CoMapEdit<string>[] | CoMapEdit<"todo" | "in-progress" | "completed">[]all) {
      const changes: any[]changes.Array<any>.push(...items: any[]): number
Appends new elements to the end of an array, and returns the new length of the array.
@paramitems New elements to add to the array.
push({
        field: stringfield,
        value: string | undefinedvalue: const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit.value?: string | undefinedvalue,
        by: Account | nullby: const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit.by: Account | nullby,
        at: Dateat: const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit.madeAt: DatemadeAt,
      });
    }
  }

  // Sort by timestamp (newest first)
  return 
const changes: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
changes.
Array<{ field: string; value: string | undefined; by: Account | null; at: Date; }>.sort(compareFn?: ((a: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}, b: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}) => number) | undefined): {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
Sorts an array in place.
This method mutates the array and returns a reference to the same array.
@paramcompareFn Function used to determine the order of the elements. It is expected to return
a negative value if the first argument is less than the second argument, zero if they're equal, and a positive
value otherwise. If omitted, the elements are sorted in ascending, ASCII character order.
```ts
[11,2,22,1].sort((a, b) => a - b)
```
sort((
a: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
a, 
b: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
b) => 
b: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
b.at: Dateat.Date.getTime(): number
Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC.
getTime() - 
a: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
a.at: Dateat.Date.getTime(): number
Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC.
getTime());
}

// Use it to show change history
const 
const auditLog: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
auditLog = 
function getAuditLog(task: Task): {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
getAuditLog(
const task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task);

const auditLog: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
auditLog.
Array<{ field: string; value: string | undefined; by: Account | null; at: Date; }>.forEach(callbackfn: (value: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}, index: number, array: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]) => void, thisArg?: any): void
Performs the specified action for each element in an array.
@paramcallbackfn A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the array.@paramthisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
forEach((
entry: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
entry) => {
  const const when: stringwhen = 
entry: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
entry.at: Dateat.Date.toLocaleString(locales?: Intl.LocalesArgument, options?: Intl.DateTimeFormatOptions): string (+2 overloads)
Converts a date and time to a string by using the current or specified locale.
@paramlocales A locale string, array of locale strings, Intl.Locale object, or array of Intl.Locale objects that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.@paramoptions An object that contains one or more properties that specify comparison options.
toLocaleString();
  const const who: string | undefinedwho = 
entry: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
entry.by: Account | nullby?.Account.profile: Profile | null | undefinedprofile?.Profile.name: string | undefinedname;
  const const what: stringwhat = 
entry: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
entry.field: stringfield;
  const const value: string | undefinedvalue = 
entry: {
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
entry.value: string | undefinedvalue;

  var console: Console
The `console` module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.

The module exports two specific components:

* A `Console` class with methods such as `console.log()`, `console.error()` and `console.warn()` that can be used to write to any Node.js stream.
* A global `console` instance configured to write to [`process.stdout`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstdout) and
[`process.stderr`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstderr). The global `console` can be used without importing the `node:console` module.

_**Warning**_: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the [`note on process I/O`](https://nodejs.org/docs/latest-v20.x/api/process.html#a-note-on-process-io) for
more information.

Example using the global `console`:

```js
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
```

Example using the `Console` class:

```js
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
```
@see[source](https://github.com/nodejs/node/blob/v20.11.1/lib/console.js)
console.Console.log(message?: any, ...optionalParams: any[]): void (+2 overloads)
[MDN Reference](https://developer.mozilla.org/docs/Web/API/console/log_static)
log(`${const when: stringwhen} - ${const who: string | undefinedwho} changed ${const what: stringwhat} to "${const value: string | undefinedvalue}"`);
  // 22/05/2025, 12:00:00 - Alice changed title to "New task"
});

Activity Feeds

Show recent activity across your application:

function 
function getRecentActivity(projects: Project[], since: Date): {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
getRecentActivity(
projects: ({
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap)[]
projects: 
type Project = {
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
Project[], since: Datesince: Date) {
  const const activity: any[]activity = [];

  for (const 
const project: {
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
project of 
projects: ({
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap)[]
projects) {
    // Get all fields that might have edits
    const const fields: string[]fields = var Object: ObjectConstructor
Provides functionality common to all JavaScript objects.
Object.ObjectConstructor.keys(o: {}): string[] (+1 overload)
Returns the names of the enumerable string properties and methods of an object.
@paramo Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
keys(
const project: {
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
project);

    // Check each field for edit history
    const 
const edits: CoMapEdits<{
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits = 
const project: {
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
project.
CoMap.$jazz: CoMapJazzApi<{
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Jazz methods for CoMaps are inside this property.

This allows CoMaps to be used as plain objects while still having
access to Jazz methods, and also doesn't limit which key names can be
used inside CoMaps.
$jazz.
CoMapJazzApi<{ readonly name: string; readonly status: "todo" | "in-progress" | "completed"; } & CoMap>.getEdits(): CoMapEdits<{
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Get the edits made to the CoMap.
@categoryCollaboration
getEdits();
    for (const const field: stringfield of const fields: string[]fields) {
      const const editField: "name" | "status"editField = const field: stringfield as keyof typeof 
const edits: CoMapEdits<{
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits;
      // Skip if no edits exist for this field
      if (!
const edits: CoMapEdits<{
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits[const editField: "name" | "status"editField]) continue;

      for (const const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit of 
const edits: CoMapEdits<{
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits[const editField: "name" | "status"editField].all: CoMapEdit<string>[] | CoMapEdit<"todo" | "in-progress" | "completed">[]all) {
        // Only include edits made after the 'since' date
        if (const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit.madeAt: DatemadeAt > since: Datesince) {
          const activity: any[]activity.Array<any>.push(...items: any[]): number
Appends new elements to the end of an array, and returns the new length of the array.
@paramitems New elements to add to the array.
push({
            project: stringproject: 
const project: {
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
project.name: stringname,
            field: stringfield,
            value: string | undefinedvalue: const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit.value?: string | undefinedvalue,
            by: Account | nullby: const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit.by: Account | nullby,
            at: Dateat: const edit: CoMapEdit<string> | CoMapEdit<"todo" | "in-progress" | "completed">edit.madeAt: DatemadeAt
          });
        }
      }
    }
  }

  return 
const activity: {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
activity.
Array<{ project: string; field: string; value: string | undefined; by: Account | null; at: Date; }>.sort(compareFn?: ((a: {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}, b: {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}) => number) | undefined): {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
Sorts an array in place.
This method mutates the array and returns a reference to the same array.
@paramcompareFn Function used to determine the order of the elements. It is expected to return
a negative value if the first argument is less than the second argument, zero if they're equal, and a positive
value otherwise. If omitted, the elements are sorted in ascending, ASCII character order.
```ts
[11,2,22,1].sort((a, b) => a - b)
```
sort((
a: {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
a, 
b: {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
b) => 
b: {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
b.at: Dateat.Date.getTime(): number
Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC.
getTime() - 
a: {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}
a.at: Dateat.Date.getTime(): number
Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC.
getTime());
}

// Show activity from the last hour
const const hourAgo: DatehourAgo = new 
var Date: DateConstructor
new (value: number | string | Date) => Date (+4 overloads)
Date(var Date: DateConstructor
Enables basic storage and retrieval of dates and times.
Date.DateConstructor.now(): number
Returns the number of milliseconds elapsed since midnight, January 1, 1970 Universal Coordinated Time (UTC).
now() - 60 * 60 * 1000);
const 
const recentActivity: {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
recentActivity = 
function getRecentActivity(projects: Project[], since: Date): {
    project: string;
    field: string;
    value: string | undefined;
    by: Account | null;
    at: Date;
}[]
getRecentActivity(
const myProjects: ({
    readonly name: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap)[]
myProjects, const hourAgo: DatehourAgo);
// [{
//   project: "New project",
//   field: "name",
//   value: "New project", 
//   by: Account,
//   at: Date
// }]

Change Indicators

Show when something was last updated:

function 
function getLastUpdated(task: Task): {
    updatedBy: any;
    updatedAt: any;
    message: string;
} | null
getLastUpdated(
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task: 
type Task = {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
Task) {
  // Find the most recent edit across all fields
  let let lastEdit: anylastEdit: any = null;

  const 
const edits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits = 
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task.
CoMap.$jazz: CoMapJazzApi<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Jazz methods for CoMaps are inside this property.

This allows CoMaps to be used as plain objects while still having
access to Jazz methods, and also doesn't limit which key names can be
used inside CoMaps.
$jazz.
CoMapJazzApi<{ readonly title: string; readonly status: "todo" | "in-progress" | "completed"; } & CoMap>.getEdits(): CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Get the edits made to the CoMap.
@categoryCollaboration
getEdits();
  for (const const field: stringfield of var Object: ObjectConstructor
Provides functionality common to all JavaScript objects.
Object.ObjectConstructor.keys(o: {}): string[] (+1 overload)
Returns the names of the enumerable string properties and methods of an object.
@paramo Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
keys(
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task)) {
    const const editField: "title" | "status"editField = const field: stringfield as keyof typeof 
const edits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits;
    // Skip if no edits exist for this field
    if (!
const edits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits[const editField: "title" | "status"editField]) continue;

    const const fieldEdit: LastAndAllCoMapEdits<string> | LastAndAllCoMapEdits<"todo" | "in-progress" | "completed">fieldEdit = 
const edits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
edits[const editField: "title" | "status"editField];
    if (const fieldEdit: LastAndAllCoMapEdits<string> | LastAndAllCoMapEdits<"todo" | "in-progress" | "completed">fieldEdit && (!let lastEdit: anylastEdit || const fieldEdit: LastAndAllCoMapEdits<string> | LastAndAllCoMapEdits<"todo" | "in-progress" | "completed">fieldEdit.madeAt: DatemadeAt > let lastEdit: anylastEdit.madeAt)) {
      let lastEdit: anylastEdit = const fieldEdit: LastAndAllCoMapEdits<string> | LastAndAllCoMapEdits<"todo" | "in-progress" | "completed">fieldEdit;
    }
  }

  if (!let lastEdit: anylastEdit) return null;

  return {
    updatedBy: anyupdatedBy: let lastEdit: anylastEdit.by?.profile?.name,
    updatedAt: anyupdatedAt: let lastEdit: anylastEdit.madeAt,
    message: stringmessage: `Last updated by ${let lastEdit: anylastEdit.by?.profile?.name} at ${let lastEdit: anylastEdit.madeAt.toLocaleString()}`
  };
}

const 
const lastUpdated: {
    updatedBy: any;
    updatedAt: any;
    message: string;
} | null
lastUpdated = 
function getLastUpdated(task: Task): {
    updatedBy: any;
    updatedAt: any;
    message: string;
} | null
getLastUpdated(
const task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task);
var console: Console
The `console` module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.

The module exports two specific components:

* A `Console` class with methods such as `console.log()`, `console.error()` and `console.warn()` that can be used to write to any Node.js stream.
* A global `console` instance configured to write to [`process.stdout`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstdout) and
[`process.stderr`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstderr). The global `console` can be used without importing the `node:console` module.

_**Warning**_: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the [`note on process I/O`](https://nodejs.org/docs/latest-v20.x/api/process.html#a-note-on-process-io) for
more information.

Example using the global `console`:

```js
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
```

Example using the `Console` class:

```js
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
```
@see[source](https://github.com/nodejs/node/blob/v20.11.1/lib/console.js)
console.Console.log(message?: any, ...optionalParams: any[]): void (+2 overloads)
[MDN Reference](https://developer.mozilla.org/docs/Web/API/console/log_static)
log(
const lastUpdated: {
    updatedBy: any;
    updatedAt: any;
    message: string;
} | null
lastUpdated?.message: string | undefinedmessage);
// "Last updated by Alice at 22/05/2025, 12:00:00"

Finding Specific Changes

Query history for specific events:

// Find when a task was completed
function function findCompletionTime(task: Task): Date | nullfindCompletionTime(
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task: 
type Task = {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
Task): Date | null {
  const const statusEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | undefinedstatusEdits = 
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task.
CoMap.$jazz: CoMapJazzApi<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Jazz methods for CoMaps are inside this property.

This allows CoMaps to be used as plain objects while still having
access to Jazz methods, and also doesn't limit which key names can be
used inside CoMaps.
$jazz.
CoMapJazzApi<{ readonly title: string; readonly status: "todo" | "in-progress" | "completed"; } & CoMap>.getEdits(): CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Get the edits made to the CoMap.
@categoryCollaboration
getEdits().status?: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | undefinedstatus;
  if (!const statusEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | undefinedstatusEdits) return null;
  
  // find() returns the FIRST completion time
  // If status toggles (completed → in-progress → completed), 
  // this gives you the earliest completion, not the latest
  const const completionEdit: CoMapEdit<"todo" | "in-progress" | "completed"> | undefinedcompletionEdit = const statusEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed">statusEdits.all: CoMapEdit<"todo" | "in-progress" | "completed">[]all.Array<CoMapEdit<"todo" | "in-progress" | "completed">>.find(predicate: (value: CoMapEdit<"todo" | "in-progress" | "completed">, index: number, obj: CoMapEdit<"todo" | "in-progress" | "completed">[]) => unknown, thisArg?: any): CoMapEdit<...> | undefined (+1 overload)
Returns the value of the first element in the array where predicate is true, and undefined
otherwise.
@parampredicate find calls predicate once for each element of the array, in ascending
order, until it finds one where predicate returns true. If such an element is found, find
immediately returns that element value. Otherwise, find returns undefined.@paramthisArg If provided, it will be used as the this value for each invocation of
predicate. If it is not provided, undefined is used instead.
find(
    edit: CoMapEdit<"todo" | "in-progress" | "completed">edit => edit: CoMapEdit<"todo" | "in-progress" | "completed">edit.value?: "todo" | "in-progress" | "completed" | undefinedvalue === "completed"
  );
  
  return const completionEdit: CoMapEdit<"todo" | "in-progress" | "completed"> | undefinedcompletionEdit?.madeAt: Date | undefinedmadeAt || null;
}

// To get the LATEST completion time instead reverse the array, then find:
function function findLatestCompletionTime(task: Task): Date | nullfindLatestCompletionTime(
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task: 
type Task = {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
Task): Date | null {
  const const statusEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | undefinedstatusEdits = 
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task.
CoMap.$jazz: CoMapJazzApi<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Jazz methods for CoMaps are inside this property.

This allows CoMaps to be used as plain objects while still having
access to Jazz methods, and also doesn't limit which key names can be
used inside CoMaps.
$jazz.
CoMapJazzApi<{ readonly title: string; readonly status: "todo" | "in-progress" | "completed"; } & CoMap>.getEdits(): CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Get the edits made to the CoMap.
@categoryCollaboration
getEdits().status?: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | undefinedstatus;
  if (!const statusEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | undefinedstatusEdits) return null;
  
  // Reverse and find (stops at first match)
  const const latestCompletionEdit: CoMapEdit<"todo" | "in-progress" | "completed"> | undefinedlatestCompletionEdit = const statusEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed">statusEdits.all: CoMapEdit<"todo" | "in-progress" | "completed">[]all
    .Array<CoMapEdit<"todo" | "in-progress" | "completed">>.slice(start?: number, end?: number): CoMapEdit<"todo" | "in-progress" | "completed">[]
Returns a copy of a section of an array.
For both start and end, a negative index can be used to indicate an offset from the end of the array.
For example, -2 refers to the second to last element of the array.
@paramstart The beginning index of the specified portion of the array.
If start is undefined, then the slice begins at index 0.@paramend The end index of the specified portion of the array. This is exclusive of the element at the index 'end'.
If end is undefined, then the slice extends to the end of the array.
slice() // Create copy to avoid mutating original
    .Array<CoMapEdit<"todo" | "in-progress" | "completed">>.reverse(): CoMapEdit<"todo" | "in-progress" | "completed">[]
Reverses the elements in an array in place.
This method mutates the array and returns a reference to the same array.
reverse()
    .Array<CoMapEdit<"todo" | "in-progress" | "completed">>.find(predicate: (value: CoMapEdit<"todo" | "in-progress" | "completed">, index: number, obj: CoMapEdit<"todo" | "in-progress" | "completed">[]) => unknown, thisArg?: any): CoMapEdit<...> | undefined (+1 overload)
Returns the value of the first element in the array where predicate is true, and undefined
otherwise.
@parampredicate find calls predicate once for each element of the array, in ascending
order, until it finds one where predicate returns true. If such an element is found, find
immediately returns that element value. Otherwise, find returns undefined.@paramthisArg If provided, it will be used as the this value for each invocation of
predicate. If it is not provided, undefined is used instead.
find(edit: CoMapEdit<"todo" | "in-progress" | "completed">edit => edit: CoMapEdit<"todo" | "in-progress" | "completed">edit.value?: "todo" | "in-progress" | "completed" | undefinedvalue === "completed");
  
  return const latestCompletionEdit: CoMapEdit<"todo" | "in-progress" | "completed"> | undefinedlatestCompletionEdit?.madeAt: Date | undefinedmadeAt || null;
}

var console: Console
The `console` module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.

The module exports two specific components:

* A `Console` class with methods such as `console.log()`, `console.error()` and `console.warn()` that can be used to write to any Node.js stream.
* A global `console` instance configured to write to [`process.stdout`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstdout) and
[`process.stderr`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstderr). The global `console` can be used without importing the `node:console` module.

_**Warning**_: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the [`note on process I/O`](https://nodejs.org/docs/latest-v20.x/api/process.html#a-note-on-process-io) for
more information.

Example using the global `console`:

```js
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
```

Example using the `Console` class:

```js
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
```
@see[source](https://github.com/nodejs/node/blob/v20.11.1/lib/console.js)
console.Console.log(message?: any, ...optionalParams: any[]): void (+2 overloads)
[MDN Reference](https://developer.mozilla.org/docs/Web/API/console/log_static)
log(function findCompletionTime(task: Task): Date | nullfindCompletionTime(
const task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task)); // First completion
var console: Console
The `console` module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.

The module exports two specific components:

* A `Console` class with methods such as `console.log()`, `console.error()` and `console.warn()` that can be used to write to any Node.js stream.
* A global `console` instance configured to write to [`process.stdout`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstdout) and
[`process.stderr`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstderr). The global `console` can be used without importing the `node:console` module.

_**Warning**_: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the [`note on process I/O`](https://nodejs.org/docs/latest-v20.x/api/process.html#a-note-on-process-io) for
more information.

Example using the global `console`:

```js
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
```

Example using the `Console` class:

```js
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
```
@see[source](https://github.com/nodejs/node/blob/v20.11.1/lib/console.js)
console.Console.log(message?: any, ...optionalParams: any[]): void (+2 overloads)
[MDN Reference](https://developer.mozilla.org/docs/Web/API/console/log_static)
log(function findLatestCompletionTime(task: Task): Date | nullfindLatestCompletionTime(
const task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task)); // Most recent completion

// Find who made a specific change
function function findWhoChanged(task: Task, field: string, value: any): Account | nullfindWhoChanged(
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task: 
type Task = {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
Task, field: stringfield: string, value: anyvalue: any) {
  const 
const taskEdits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
taskEdits = 
task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task.
CoMap.$jazz: CoMapJazzApi<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Jazz methods for CoMaps are inside this property.

This allows CoMaps to be used as plain objects while still having
access to Jazz methods, and also doesn't limit which key names can be
used inside CoMaps.
$jazz.
CoMapJazzApi<{ readonly title: string; readonly status: "todo" | "in-progress" | "completed"; } & CoMap>.getEdits(): CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
Get the edits made to the CoMap.
@categoryCollaboration
getEdits();
  const const fieldEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | LastAndAllCoMapEdits<string> | undefinedfieldEdits = 
const taskEdits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
taskEdits[field: stringfield as keyof typeof 
const taskEdits: CoMapEdits<{
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap>
taskEdits];
  if (!const fieldEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | LastAndAllCoMapEdits<string> | undefinedfieldEdits) return null;
  
  const const matchingEdit: CoMapEdit<string> | undefinedmatchingEdit = const fieldEdits: LastAndAllCoMapEdits<"todo" | "in-progress" | "completed"> | LastAndAllCoMapEdits<string>fieldEdits.all: CoMapEdit<"todo" | "in-progress" | "completed">[] | CoMapEdit<string>[]all.Array<T>.find(predicate: (value: CoMapEdit<string>, index: number, obj: CoMapEdit<string>[]) => unknown, thisArg?: any): CoMapEdit<string> | undefined
Returns the value of the first element in the array where predicate is true, and undefined
otherwise.
@parampredicate find calls predicate once for each element of the array, in ascending
order, until it finds one where predicate returns true. If such an element is found, find
immediately returns that element value. Otherwise, find returns undefined.@paramthisArg If provided, it will be used as the this value for each invocation of
predicate. If it is not provided, undefined is used instead.
find(edit: CoMapEdit<string>edit => edit: CoMapEdit<string>edit.value?: string | undefinedvalue === value: anyvalue);
  return const matchingEdit: CoMapEdit<string> | undefinedmatchingEdit?.by: Account | null | undefinedby || null;
}
const const account: Account | nullaccount = function findWhoChanged(task: Task, field: string, value: any): Account | nullfindWhoChanged(
const task: {
    readonly title: string;
    readonly status: "todo" | "in-progress" | "completed";
} & CoMap
task, "status", "completed");
var console: Console
The `console` module provides a simple debugging console that is similar to the
JavaScript console mechanism provided by web browsers.

The module exports two specific components:

* A `Console` class with methods such as `console.log()`, `console.error()` and `console.warn()` that can be used to write to any Node.js stream.
* A global `console` instance configured to write to [`process.stdout`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstdout) and
[`process.stderr`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstderr). The global `console` can be used without importing the `node:console` module.

_**Warning**_: The global console object's methods are neither consistently
synchronous like the browser APIs they resemble, nor are they consistently
asynchronous like all other Node.js streams. See the [`note on process I/O`](https://nodejs.org/docs/latest-v20.x/api/process.html#a-note-on-process-io) for
more information.

Example using the global `console`:

```js
console.log('hello world');
// Prints: hello world, to stdout
console.log('hello %s', 'world');
// Prints: hello world, to stdout
console.error(new Error('Whoops, something bad happened'));
// Prints error message and stack trace to stderr:
//   Error: Whoops, something bad happened
//     at [eval]:5:15
//     at Script.runInThisContext (node:vm:132:18)
//     at Object.runInThisContext (node:vm:309:38)
//     at node:internal/process/execution:77:19
//     at [eval]-wrapper:6:22
//     at evalScript (node:internal/process/execution:76:60)
//     at node:internal/main/eval_string:23:3

const name = 'Will Robinson';
console.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to stderr
```

Example using the `Console` class:

```js
const out = getStreamSomehow();
const err = getStreamSomehow();
const myConsole = new console.Console(out, err);

myConsole.log('hello world');
// Prints: hello world, to out
myConsole.log('hello %s', 'world');
// Prints: hello world, to out
myConsole.error(new Error('Whoops, something bad happened'));
// Prints: [Error: Whoops, something bad happened], to err

const name = 'Will Robinson';
myConsole.warn(`Danger ${name}! Danger!`);
// Prints: Danger Will Robinson! Danger!, to err
```
@see[source](https://github.com/nodejs/node/blob/v20.11.1/lib/console.js)
console.Console.log(message?: any, ...optionalParams: any[]): void (+2 overloads)
[MDN Reference](https://developer.mozilla.org/docs/Web/API/console/log_static)
log(const account: Account | nullaccount?.Account.profile: Profile | null | undefinedprofile?.Profile.name: string | undefinedname);
// Alice

Further Reading

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