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tslib

Runtime library for TypeScript helper functions


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Maintainers
9
Weekly downloads
235,728,407
decreased by-8.67%

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Package description

What is tslib?

The tslib package is a runtime library for TypeScript that includes helper functions used by TypeScript emitted code when using various advanced features of the language such as async/await, for...of, spread, rest, and decorators. It is intended to be used with TypeScript's `importHelpers` flag to reduce code duplication and save on bundle size.

What are tslib's main functionalities?

Async/Await

Provides a helper function for handling asynchronous operations using async/await syntax in environments that do not natively support these features.

__awaiter(this, void 0, void 0, function* () { const result = yield someAsyncFunction(); return result; })

Spread and Rest

Offers a helper function to handle spread and rest operations with arrays, allowing for the combination and copying of arrays.

__spreadArrays([1, 2], [3, 4])

Decorators

Includes helper functions for applying decorators to classes and methods, which are a TypeScript feature for adding annotations and a meta-programming syntax for class declarations and members.

__decorate([decoratorsArray], target, key, desc)

Generators

Provides a helper function for working with generators and the yield keyword, enabling the use of generator functions in environments that do not support them natively.

__generator(this, function (_a) { switch (_a.label) { case 0: _a.trys.push([0, 2, , 3]); return [4 /*yield*/, someGeneratorFunction()]; case 1: _a.sent(); return [3 /*break*/, 3]; case 2: _a.sent(); return [3 /*break*/, 3]; case 3: return [2 /*return*/]; } });

Other packages similar to tslib

Readme

Source

tslib

This is a runtime library for TypeScript that contains all of the TypeScript helper functions.

This library is primarily used by the --importHelpers flag in TypeScript. When using --importHelpers, a module that uses helper functions like __extends and __assign in the following emitted file:

var __assign = (this && this.__assign) || Object.assign || function(t) {
    for (var s, i = 1, n = arguments.length; i < n; i++) {
        s = arguments[i];
        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
            t[p] = s[p];
    }
    return t;
};
exports.x = {};
exports.y = __assign({}, exports.x);

will instead be emitted as something like the following:

var tslib_1 = require("tslib");
exports.x = {};
exports.y = tslib_1.__assign({}, exports.x);

Because this can avoid duplicate declarations of things like __extends, __assign, etc., this means delivering users smaller files on average, as well as less runtime overhead. For optimized bundles with TypeScript, you should absolutely consider using tslib and --importHelpers.

Installing

For the latest stable version, run:

npm

# TypeScript 2.3.3 or later
npm install --save tslib

# TypeScript 2.3.2 or earlier
npm install --save tslib@1.6.1

yarn

# TypeScript 2.3.3 or later
yarn add tslib

# TypeScript 2.3.2 or earlier
yarn add tslib@1.6.1

bower

# TypeScript 2.3.3 or later
bower install tslib

# TypeScript 2.3.2 or earlier
bower install tslib@1.6.1

JSPM

# TypeScript 2.3.3 or later
jspm install tslib

# TypeScript 2.3.2 or earlier
jspm install tslib@1.6.1

Usage

Set the importHelpers compiler option on the command line:

tsc --importHelpers file.ts

or in your tsconfig.json:

{
    "compilerOptions": {
        "importHelpers": true
    }
}
For bower and JSPM users

You will need to add a paths mapping for tslib, e.g. For Bower users:

{
    "compilerOptions": {
        "module": "amd",
        "importHelpers": true,
        "baseUrl": "./",
        "paths": {
            "tslib" : ["bower_components/tslib/tslib.d.ts"]
        }
    }
}

For JSPM users:

{
    "compilerOptions": {
        "module": "system",
        "importHelpers": true,
        "baseUrl": "./",
        "paths": {
            "tslib" : ["jspm_packages/npm/tslib@2.0.1/tslib.d.ts"]
        }
    }
}

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Last updated on 06 Aug 2020

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