To help you get started, we've collected the most common ways that tslib is being used within popular public projects.

angular / core-builds / esm5 / testing / src / r3_test_bed_compiler.js View on Github

R3TestBedCompiler.prototype.getOverriddenProviders = function (providers) {
        var _this = this;
        if (!providers || !providers.length || this.providerOverridesByToken.size === 0)
            return [];
        var overrides = this.getProviderOverrides(providers);
        var hasMultiProviderOverrides = overrides.some(isMultiProvider);
        var overriddenProviders = tslib_1.__spread(providers, overrides);
        // No additional processing is required in case we have no multi providers to override
        if (!hasMultiProviderOverrides) {
            return overriddenProviders;
        }
        var final = [];
        var seenMultiProviders = new Set();
        // We iterate through the list of providers in reverse order to make sure multi provider
        // overrides take precedence over the values defined in provider list. We also fiter out all
        // multi providers that have overrides, keeping overridden values only.
        forEachRight(overriddenProviders, function (provider) {
            var token = getProviderToken(provider);
            if (isMultiProvider(provider) && _this.providerOverridesByToken.has(token)) {
                if (!seenMultiProviders.has(token)) {
                    seenMultiProviders.add(token);
                    if (provider && provider.useValue && Array.isArray(provider.useValue)) {
                        forEachRight(provider.useValue, function (value) {

View more ways to use tslib

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 3.9.2 or later
npm install tslib

# TypeScript 3.8.4 or earlier
npm install tslib@^1

# TypeScript 2.3.2 or earlier
npm install tslib@1.6.1

yarn

# TypeScript 3.9.2 or later
yarn add tslib

# TypeScript 3.8.4 or earlier
yarn add tslib@^1

# TypeScript 2.3.2 or earlier
yarn add tslib@1.6.1

bower

# TypeScript 3.9.2 or later
bower install tslib

# TypeScript 3.8.4 or earlier
bower install tslib@^1

# TypeScript 2.3.2 or earlier
bower install tslib@1.6.1

JSPM

# TypeScript 3.9.2 or later
jspm install tslib

# TypeScript 3.8.4 or earlier
jspm install tslib@^1

# 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.x.y/tslib.d.ts"]
        }
    }
}

Deployment

• Choose your new version number
• Set it in package.json and bower.json
• Create a tag: git tag [version]
• Push the tag: git push --tags
• Create a release in GitHub
• Run the publish to npm workflow

Done.

Contribute

There are many ways to contribute to TypeScript.

• Submit bugs and help us verify fixes as they are checked in.
• Review the source code changes.
• Engage with other TypeScript users and developers on StackOverflow.
• Join the #typescript discussion on Twitter.
• Contribute bug fixes.

Documentation

• Quick tutorial
• Programming handbook
• Homepage