String.prototype.padStart

An ES2017 spec-compliant String.prototype.padStart shim. Invoke its "shim" method to shim String.prototype.padStart if it is unavailable.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

Most common usage:

var padStart = require('string.prototype.padstart');

assert(padStart('foo', 5, 'bar') === 'bafoo');

padStart.shim();

assert(padStart('foo', 2) === 'foo'.padStart(2));

Tests

Simply clone the repo, npm install, and run npm test

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

v3.1.7 - 2025-03-13

Commits

• [actions] use reusable workflows ae59509
• [Dev Deps] update @es-shims/api, @ljharb/eslint-config, auto-changelog, has-strict-mode, tape 42bb53b
• [Deps] update call-bind, es-abstract, es-object-atoms 76ef765
• [Refactor] use call-bound directly 8d2e2ae
• [Tests] replace aud with npm audit e3270b6
• [Deps] update es-abstract 002c22f
• [Dev Deps] add missing peer dep f9efe37

v3.1.6 - 2024-03-16

Commits

• [Refactor] update es-abstract; use es-object-atoms a3025f1
• [Dev Deps] update aud, npmignore, tape 421d652
• [Deps] update call-bind, define-properties b70498f

v3.1.5 - 2023-08-29

Commits

• [Deps] update define-properties, es-abstract 42a83bc
• [Dev Deps] update @es-shims/api, @ljharb/eslint-config, aud, tape cdcb754

v3.1.4 - 2022-11-07

Commits

• [actions] reuse common workflows dab6400
• [meta] use npmignore to autogenerate an npmignore file 986e57a
• [meta] add auto-changelog 2ee6cfc
• [Dev Deps] update eslint, @ljharb/eslint-config, @es-shims/api, safe-publish-latest, tape b1e92b1
• [Deps] update define-properties, es-abstract 92e11e2
• [Dev Deps] update eslint, @ljharb/eslint-config, aud, functions-have-names, tape 509d44d
• [actions] update rebase action to use reusable workflow 7769cb6
• [actions] update codecov uploader 52a16c8

3.1.3 / 2021-10-04

• [Robustness] avoid a runtime call to .push
• [Deps] update es-abstract
• [readme] add github actions/codecov badges
• [meta] use prepublishOnly script for npm 7+
• [actions] update workflows
• [actions] use node/install instead of node/run; use codecov action
• [Dev Deps] update eslint, @ljharb/eslint-config, @es-shims/api, aud, tape

3.1.2 / 2021-02-20

• [meta] do not publish github action workflow files
• [Deps] update call-bind, es-abstract
• [Dev Deps] update eslint, @ljharb/eslint-config, aud, functions-have-names, has-strict-mode, tape
• [actions] update workflows
• [Tests] increase coverage

3.1.1 / 2020-11-21

• [Deps] update es-abstract; use call-bind where applicable
• [Dev Deps] update eslint, @ljharb/eslint-config, functions-have-names, tape; add aud
• [actions] add "Allow Edits" workflow
• [actions] switch Automatic Rebase workflow to pull_request_target event
• [meta] gitignore nyc output
• [meta] add safe-publish-latest
• [Tests] migrate tests to Github Actions
• [Tests] run nyc on all tests
• [Tests] add implementation test; run es-shim-api in postlint; use tape runner
• [Tests] update function-bind

3.1.0 / 2019-12-14

• [New] add auto entry point
• [Refactor] use split-up es-abstract (77% bundle size decrease)
• [readme] remove testling
• [readme] Fixed syntax error in README (#12)
• [readme] Stage 4
• [Deps] update define-properties, es-abstract, function-bind
• [Dev Deps] update eslint, @ljharb/eslint-config, functions-have-names, covert, tape, @es-shims/api
• [meta] add funding field
• [meta] Only apps should have lockfiles.
• [Tests] use pretest/posttest for linting/security
• [Tests] use functions-have-names
• [Tests] use npx aud instead of nsp or npm audit with hoops
• [Tests] remove jscs
• [Tests] use shared travis-ci configs
• [actions] add automatic rebasing / merge commit blocking

3.0.0 / 2015-11-17

• Renamed to padStart/padEnd per November 2015 TC39 meeting.

2.0.0 / 2015-09-25

• [Breaking] Take the first part of the fillStr when truncating (#1)
• Implement the es-shim API
• [Tests] up to io.js v3.3, node v4.1
• [Deps] update es-abstract
• [Dev Deps] Update tape, jscs, eslint, @ljharb/eslint-config, nsp
• [Refactor] Remove redundant max operation, per https://github.com/ljharb/proposal-string-pad-left-right/pull/2

1.0.0 / 2015-07-30

• v1.0.0