Douglas Crockford douglas@crockford.com
Branch | master (v2024.11.24) |
beta (Web Demo) |
alpha (Development) |
---|---|---|---|
CI | |||
Coverage | |||
Demo | |||
Artifacts |
-
- API Doc
-
Directive
/*jslint*/
/*jslint beta*/
/*jslint bitwise*/
/*jslint browser*/
/*jslint convert*/
/*jslint couch*/
/*jslint devel*/
/*jslint eval*/
/*jslint fart*/
/*jslint for*/
/*jslint getset*/
/*jslint indent2*/
/*jslint long*/
/*jslint node*/
/*jslint nomen*/
/*jslint single*/
/*jslint subscript*/
/*jslint this*/
/*jslint trace*/
/*jslint unordered*/
/*jslint white*/
- Directive
/*global*/
- Directive
/*property*/
- Directive
/*jslint-disable*/.../*jslint-enable*/
- Directive
//jslint-ignore-line
To install, just download and save https://www.jslint.com/jslint.mjs to file:
#!/bin/sh
curl -L https://www.jslint.com/jslint.mjs > jslint.mjs
- shell output
#!/bin/sh
printf "console.log('hello world');\n" > hello.js
node jslint.mjs hello.js
- shell output
#!/bin/sh
node --input-type=module --eval '
/*jslint devel*/
// Import JSLint in ES Module environment.
import jslint from "./jslint.mjs";
let globals = ["caches", "indexedDb"];
let options = {browser: true};
let result;
let source = "console.log(\u0027hello world\u0027);\n";
// JSLint <source> and print <formatted_message>.
result = jslint.jslint(source, options, globals);
result.warnings.forEach(function ({
formatted_message
}) {
console.error(formatted_message);
});
'
- shell output
#!/bin/sh
node --eval '
/*jslint devel*/
(async function () {
let globals = ["caches", "indexedDb"];
let jslint;
let options = {browser: true};
let result;
let source = "console.log(\u0027hello world\u0027);\n";
// Import JSLint in CommonJS environment.
jslint = await import("./jslint.mjs");
jslint = jslint.default;
// JSLint <source> and print <formatted_message>.
result = jslint.jslint(source, options, globals);
result.warnings.forEach(function ({
formatted_message
}) {
console.error(formatted_message);
});
}());
'
- shell output
#!/bin/sh
# JSLint directory '.'
node jslint.mjs .
- shell output
#!/bin/sh
printf "function foo() {console.log('hello world');}\n" > hello.js
# Create JSLint report from file 'hello.js' in shell.
node jslint.mjs \
jslint_report=.artifact/jslint_report_hello.html \
hello.js
- shell output
- screenshot file .artifact/jslint_report_hello.html
#!/bin/sh
node --input-type=module --eval '
/*jslint devel*/
import jslint from "./jslint.mjs";
import fs from "fs";
(async function () {
let result;
let source = "function foo() {console.log(\u0027hello world\u0027);}\n";
// Create JSLint report from <source> in javascript.
result = jslint.jslint(source);
result = jslint.jslint_report(result);
result = `<body class="JSLINT_ JSLINT_REPORT_">\n${result}</body>\n`;
await fs.promises.mkdir(".artifact/", {recursive: true});
await fs.promises.writeFile(".artifact/jslint_report_hello.html", result);
console.error("wrote file .artifact/jslint_report_hello.html");
}());
'
- shell output
- screenshot file .artifact/jslint_report_hello.html
#!/bin/sh
git clone https://github.com/tryghost/node-sqlite3 node-sqlite3-sh \
--branch=v5.0.11 \
--depth=1 \
--single-branch
cd node-sqlite3-sh
npm install
# Create V8 coverage report from program `npm run test` in shell.
node ../jslint.mjs \
v8_coverage_report=../.artifact/coverage_sqlite3_sh/ \
--exclude=tes?/ \
--exclude=tes[!0-9A-Z_a-z-]/ \
--exclude=tes[0-9A-Z_a-z-]/ \
--exclude=tes[^0-9A-Z_a-z-]/ \
--exclude=test/**/*.js \
--exclude=test/suppor*/*elper.js \
--exclude=test/suppor?/?elper.js \
--exclude=test/support/helper.js \
--include=**/*.cjs \
--include=**/*.js \
--include=**/*.mjs \
--include=li*/*.js \
--include=li?/*.js \
--include=lib/ \
--include=lib/**/*.js \
--include=lib/*.js \
--include=lib/sqlite3.js \
npm run test
- shell output
- screenshot file .artifact/coverage_sqlite3_sh/index.html
- screenshot file .artifact/coverage_sqlite3_sh/lib/sqlite3.js.html
#!/bin/sh
git clone https://github.com/tryghost/node-sqlite3 node-sqlite3-js \
--branch=v5.0.11 \
--depth=1 \
--single-branch
cd node-sqlite3-js
npm install
node --input-type=module --eval '
/*jslint node*/
import jslint from "../jslint.mjs";
(async function () {
// Create V8 coverage report from program `npm run test` in javascript.
await jslint.v8CoverageReportCreate({
coverageDir: "../.artifact/coverage_sqlite3_js/",
processArgv: [
"--exclude=tes?/",
"--exclude=tes[!0-9A-Z_a-z-]/",
"--exclude=tes[0-9A-Z_a-z-]/",
"--exclude=tes[^0-9A-Z_a-z-]/",
"--exclude=test/**/*.js",
"--exclude=test/suppor*/*elper.js",
"--exclude=test/suppor?/?elper.js",
"--exclude=test/support/helper.js",
"--include=**/*.cjs",
"--include=**/*.js",
"--include=**/*.mjs",
"--include=li*/*.js",
"--include=li?/*.js",
"--include=lib/",
"--include=lib/**/*.js",
"--include=lib/*.js",
"--include=lib/sqlite3.js",
"npm", "run", "test"
]
});
}());
'
- shell output
- screenshot file .artifact/coverage_sqlite3_js/index.html
- screenshot file .artifact/coverage_sqlite3_js/lib/sqlite3.js.html
-
Download and save
jslint.mjs
,jslint_wrapper_codemirror.js
to file. -
Edit, save, and serve example html-file below:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CodeMirror: JSLint Demo</title>
<!-- Assets from codemirror. -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.10/codemirror.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.10/addon/lint/lint.css">
<script defer src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.10/codemirror.js"></script>
<script defer src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.10/mode/javascript/javascript.js"></script>
<script defer src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.10/addon/lint/lint.js"></script>
<!-- Assets from jslint. -->
<script type="module" src="./jslint.mjs?window_jslint=1"></script>
<script defer src="./jslint_wrapper_codemirror.js"></script>
<style>
body {
background: #bbb;
color: #333;
font-family: sans-serif;
margin: 20px;
}
.JSLINT_.JSLINT_REPORT_ {
margin-top: 20px;
}
#editor1 {
height: 300px;
width: 100%;
}
</style>
</head>
<body>
<h1>CodeMirror: JSLint Demo</h1>
<h3>
This demo will auto-lint the code below, and auto-generate a report as you type.
</h3>
<!-- Container for codemirror-editor. -->
<textarea id="editor1">console.log('hello world');</textarea>
<!-- Container for jslint-report. -->
<div class="JSLINT_ JSLINT_REPORT_"></div>
<script type=module>
window.addEventListener("load", function () {
let editor = window.CodeMirror.fromTextArea(document.getElementById(
"editor1"
), {
gutters: [
"CodeMirror-lint-markers"
],
indentUnit: 4,
lineNumbers: true,
lint: {
lintOnChange: true, // Enable auto-lint.
options: {
// browser: true,
// node: true
globals: [
// "caches",
// "indexedDb"
]
}
},
mode: "javascript"
});
// Initialize event-handling before linter is run.
editor.on("lintJslintBefore", function (/* options */) {
// options.browser = true;
// options.node = true;
// options.globals = [
// "caches",
// "indexedDb"
// ];
return;
});
// Initialize event-handling after linter is run.
editor.on("lintJslintAfter", function (options) {
// Generate jslint-report from options.result.
document.querySelector(
".JSLINT_REPORT_"
).innerHTML = window.jslint.jslint_report(options.result);
});
// Manually trigger linter.
editor.performLint();
});
</script>
</body>
</html>
- Live example at https://www.jslint.com/jslint_wrapper_codemirror.html
- Download and save
jslint.mjs
,jslint_wrapper_vim.vim
to directory~/.vim/
- Add vim-command
:source ~/.vim/jslint_wrapper_vim.vim
to file~/.vimrc
- If above files were saved to custom-directory, then use that directory instead, e.g.:
- save
jslint.mjs
,jslint_wrapper_vim.vim
to directory~/vimfiles/
- vim-command
:source ~/vimfiles/jslint_wrapper_vim.vim
- save
- If above files were saved to custom-directory, then use that directory instead, e.g.:
- Vim can now jslint files (via nodejs):
- with vim-command
:SaveAndJslint
- with vim-key-combo
<Ctrl-S> <Ctrl-J>
- with vim-command
- screenshot
- In VSCode, search and install extension
vscode-jslint
- In VSCode, while editing a javascript file:
- right-click context-menu and select
[JSLint - Lint File]
- or use key-binding
[Ctrl + Shift + J], [L]
- or use key-binding
[ Cmd + Shift + J], [L]
for Mac
- right-click context-menu and select
- screenshot
-
jslint.mjs contains the jslint function. It parses and analyzes a source file, returning an object with information about the file. It can also take an object that sets options.
-
index.html runs the jslint.mjs function in a web page.
JSLint can be run anywhere that JavaScript (or Java) can run.
The place to express yourself in programming is in the quality of your ideas and the efficiency of their execution. The role of style in programming is the same as in literature: It makes for better reading. A great writer doesn't express herself by putting the spaces before her commas instead of after, or by putting extra spaces inside her parentheses. A great writer will slavishly conform to some rules of style, and that in no way constrains her power to express herself creatively. See for example William Strunk's The Elements of Style [https://www.crockford.com/style.html].
This applies to programming as well. Conforming to a consistent style improves readability, and frees you to express yourself in ways that matter. JSLint here plays the part of a stern but benevolent editor, helping you to get the style right so that you can focus your creative energy where it is most needed.
/*jslint beta*/
// Enable experimental warnings.
// Warn if global variables are redefined.
// Warn if const / let statements are not declared at top of function or
// script, similar to var statements.
// Warn if const / let / var statements are not declared in ascii-order.
// Warn if named-functions are not declared in ascii-order.
// Warn if cases in switch-statements are not in ascii-order.
/*jslint bitwise*/
// Allow bitwise operator.
let foo = 0 | 1;
/*jslint browser*/
// Assume browser environment.
localStorage.getItem("foo");
/*jslint convert*/
// Allow conversion operator.
let foo = new Date() + "";
let bar = !!0;
/*jslint couch*/
// Assume CouchDb environment.
registerType("text-json", "text/json");
/*jslint devel*/
// Allow console.log() and friends.
console.log("hello");
/*jslint eval*/
// Allow eval().
eval("1");
/*jslint fart*/
// Allow complex fat-arrow.
let foo = async ({bar, baz}) => {
return await bar(baz);
};
/*jslint for*/
// Allow for-loop.
function foo() {
let ii;
for (ii = 0; ii < 10; ii += 1) {
foo();
}
}
/*jslint getset, this, devel*/
// Allow get() and set().
let foo = {
bar: 0,
get getBar() {
return this.bar;
},
set setBar(value) {
this.bar = value;
}
};
console.log(foo.getBar); // 0
foo.setBar = 1;
console.log(foo.getBar); // 1
/*jslint indent2*/
// Use 2-space indent.
function foo() {
return;
}
/*jslint long*/
// Allow long lines.
let foo = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
/*jslint node*/
// Assume Node.js environment.
require("fs");
/*jslint nomen*/
// Allow weird property name.
let foo = {};
foo._bar = 1;
/*jslint single*/
// Allow single-quote strings.
let foo = '';
/*jslint subscript*/
// Allow identifiers in subscript-notation.
let foo = {};
foo["bar"] = 1;
/*jslint this*/
// Allow 'this'.
function foo() {
return this;
}
/*jslint trace*/
// Include jslint stack-trace in warnings.
console.log('hello world');
/*
1. Undeclared 'console'.
console.log('hello world');
Error
at warn_at (...)
at warn (...)
at lookup (...)
at pre_v (...)
at jslint.mjs
2. Use double quotes, not single quotes.
console.log(...);
Error
at warn_at (...)
at lex_string (...)
at lex_token (...)
at jslint_phase2_lex (...)
at Function.jslint (...)
at jslint.mjs
*/
/*jslint unordered*/
// Allow unordered cases, params, properties, variables, and exports.
let foo = {bb: 1, aa: 0};
function bar({
bb = 1,
aa = 0
}) {
return aa + bb;
}
export {
foo,
bar
};
/*jslint white*/
// Allow messy whitespace.
let foo = 1; let bar = 2;
/*global foo, bar*/
// Declare global variables foo, bar.
foo();
bar();
/*property foo, bar*/
// Restrict property-access to only .foo, .bar.
let aa = {bar: 1, foo: 2};
/*jslint-disable*/
JSLint will ignore and treat this region as blank-lines.
Syntax error.
/*jslint-enable*/
// JSLint will ignore non-fatal warnings at given line.
eval("1"); //jslint-ignore-line
- JSLint is under Unlicense License.
- CodeMirror editor is under MIT License.
- Function
v8CoverageListMerge
is derived from MIT Licensed v8-coverage.
- find highest issue-number at https://github.com/jslint-org/jslint/issues/, https://github.com/jslint-org/jslint/pulls/, and add +1 to it for PR-xxx
-
shGitPullrequest beta beta
- verify ci-success for origin-branch-alpha
- https://github.com/kaizhu256/jslint/actions
-
git push upstream alpha -f
- verify ci-success for upstream-branch-alpha
- https://github.com/jslint-org/jslint/actions
- goto https://github.com/jslint-org/jslint/compare/beta...kaizhu256:jslint:branch-p2024.11.24
- click
Create pull request
- input
Add your description here...
with:
Fixes #xxx.
- <primary-commit-message>
This PR will ...
This PR will additionally:
- <secondary-commit-message>
...
<screenshot>
- verify
commit into jslint-org:beta
- click
Create pull request
- verify ci-success for pull-request
- https://github.com/jslint-org/jslint/actions/workflows/on_pull_request.yml
- wait awhile before continuing ...
- click
Rebase and merge
- verify ci-success for upstream-branch-beta
- https://github.com/jslint-org/jslint/actions
-
shGitPullrequestCleanup
- verify ci-success for origin-branch-alpha
- https://github.com/kaizhu256/jslint/actions
-
git push upstream alpha -f
- verify ci-success for upstream-branch-alpha
- https://github.com/jslint-org/jslint/actions
- click
Delete branch
-
shGitPullrequest master beta
- verify ci-success for origin-branch-alpha
- https://github.com/kaizhu256/jslint/actions
-
git push upstream alpha -f
- verify ci-success for upstream-branch-alpha
- https://github.com/jslint-org/jslint/actions
- goto https://github.com/jslint-org/jslint/compare/beta...kaizhu256:jslint:branch-v2024.11.24
- click
Create pull request
- input
Add a title
with:# v20yy.mm.dd
- input
Add a description
with:
- <primary-commit-message>
- <secondary-commit-message>
- verify
commit into jslint-org:beta
- click
Create pull request
- verify ci-success for pull-request
- https://github.com/jslint-org/jslint/actions/workflows/on_pull_request.yml
- wait awhile before continuing ...
- click
Rebase and merge
- verify ci-success for upstream-branch-beta
- https://github.com/jslint-org/jslint/actions
-
shGitPullrequestCleanup
- verify ci-success for origin-branch-alpha
- https://github.com/kaizhu256/jslint/actions
-
git push upstream alpha -f
- verify ci-success for upstream-branch-alpha
- https://github.com/jslint-org/jslint/actions
- click
Delete branch
-
git push origin beta:master
- verify ci-success for origin-branch-master
- https://github.com/kaizhu256/jslint/actions
-
git push upstream beta:master
- verify ci-success for upstream-branch-master
- https://github.com/jslint-org/jslint/actions
-
git push upstream beta:master
- verify ci-success for upstream-branch-master
- https://github.com/jslint-org/jslint/actions
- goto https://github.com/jslint-org/jslint/releases/new
- input
Choose a tag
with:v20yy.mm.dd
- click
Create new tag: v20yy.mm.dd on publish
- verify correct-year
20yy
- verify correct-year
- select
Target: master
- select
Previous tag:auto
- input
Release title
with:v20yy.mm.dd - <primary-commit-message>
- input
Describe this release
with:
- <primary-commit-message>
- <secondary-commit-message>
- click
Generate release notes
- click
Set as the latest release
- click
Preview
and review - click
Publish release
- verify ci-success for upstream-branch-publish
- https://github.com/jslint-org/jslint/actions
- verify email-notification
Successfully published @jslint-org/jslint@20yy.mm.dd
- goto https://github.com/jslint-org/jslint/tree/gh-pages/branch-beta/.artifact/jslint_wrapper_vscode
- click
vscode-jslint-20yy.mm.dd.vsix
- click
Raw
to download - goto https://marketplace.visualstudio.com/manage/publishers/jslint
- right-click
Update
- upload downloaded file
vscode-jslint-20yy.mm.dd.vsix
- click 'Upload'
- verify email-notification
[Succeeded] Extension publish on Visual Studio Marketplace - vscode-jslint