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@billogram/task-runner

A simple task runner

Install

yarn add @billogram/task-runner

Usage

Define a task.

export default function customTask() {
    return async function run(name: string; context: TaskContext) {
        // Do something.
    }
}

Add the task to a task runner.

import TaskRunner from '@billogram/task-runner';
import customTask from './customTask';


const runner = new TaskRunner('build-scripts');
runner.add('custom-task', customTask());

runner.addSequence('custom-sequence', [
    'custom-task',
]);

runner.addSequence('custom-sequence-with-context', [
    'custom-task',
], {
    silent: true,
});

runner.addSequence('custom-sequence-with-hooks', {
    pre: [
        // add any pre tasks here.
    ],
    script: [
        'custom-task',
    ],
    post: [
        // add any post tasks here.
    ],
});

runner.addSequence('pre-task-sequence, [
    // add tasks here.
]);

runner.addSequence('post-task-sequence, [
    // add tasks here.
]);

runner.addSequence('custom-sequence-with-hooks-simple', {
    pre: 'pre-task-sequence',
    script: [
        'custom-task',
    ],
    post: 'post-task-sequence',
});

runner.start('custom-task', {
    skipPreScript: false,
    skipScript: false,
    skipPostScript: false,
});

// or...

runner.start('custom-task', {
    skipPreScript: [],
    skipScript: [],
    skipPostScript: [],
});

API

Information about types used in the task runner can be found here.

TaskContext

A TaskContext is passed to every task. The context has the following properties:

{
    // Should the sequence tasks be run concurrently.
    concurrent: TaskContextConcurrentType;
    // The build environment.
    env?: 'development' | 'production';
    // Any flags that was passed to the task runners start method.
    flags: TaskFlags;
    // A flag to determine if the task should be run in silent mode. 
    // It is the responsibility of the task to define what this means.
    silent: boolean;
    // Run a specific executable with the specified arguments. The exit
    // code of the executable is the return value of this function.
    run(bin: string, args: string[], opts: CommonOptions): Promise<TaskContextRunResult>;
}

The TaskRunner uses execa internally and opts are the options for execa.

TaskHandler

A task is a function with the following signature.

type TaskHandler = (name: string, context: TaskContext) => Promise<TaskContextRunResult>;

TaskRunner

The TaskRunner is used for coordinating the task execution.

constructor(scriptName: string)

The scriptName is the name that will be displayed together with command name when running a command (task).

commands(): string[]

A list of the names of all the tasks that have been added to the task runner.

add(name: string, handler: TaskHandler): void

Add a task to the task runner.

addSequence(name: string, sequence: TaskSequence, context?: Partial<TaskContext>): void

Add a sequence of tasks to the task runner with an optional custom context.

start(name: string, flags: TaskFlags = {}): void

Start a specific command (task). Flags will be passed to the TaskContext.

There are a number of special flags: skipPreScript, skipScript, and skipPostScript. These will not be passed to the TaskContext instead of they will be used to skip either the pre, script, or post phase of a task sequence.

Note

This library is being published with our use cases in mind and is not necessarily meant to be consumed by the broader public. We probably won't take your feature requests unless they align with our own needs.

License

MIT