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feat!: rename rule shebang => hashbang, deprecate rule shebang (#198)
fixes #196
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| # Require correct usage of hashbang (`n/hashbang`) | ||
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| 💼 This rule is enabled in the following [configs](https://github.com/eslint-community/eslint-plugin-n#-configs): ☑️ `flat/recommended`, 🟢 `flat/recommended-module`, ✅ `flat/recommended-script`, ☑️ `recommended`, 🟢 `recommended-module`, ✅ `recommended-script`. | ||
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| 🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix). | ||
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| <!-- end auto-generated rule header --> | ||
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| When we make a CLI tool with Node.js, we add `bin` field to `package.json`, then we add a hashbang the entry file. | ||
| This rule suggests correct usage of hashbang. | ||
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| ## 📖 Rule Details | ||
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| This rule looks up `package.json` file from each linting target file. | ||
| Starting from the directory of the target file, it goes up ancestor directories until found. | ||
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| If `package.json` was not found, this rule does nothing. | ||
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| This rule checks `bin` field of `package.json`, then if a target file matches one of `bin` files, it checks whether or not there is a correct hashbang. | ||
| Otherwise it checks whether or not there is not a hashbang. | ||
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| The following patterns are considered problems for files in `bin` field of `package.json`: | ||
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| ```js | ||
| console.log("hello"); /*error This file needs hashbang "#!/usr/bin/env node".*/ | ||
| ``` | ||
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| ```js | ||
| #!/usr/bin/env node /*error This file must not have Unicode BOM.*/ | ||
| console.log("hello"); | ||
| // If this file has Unicode BOM. | ||
| ``` | ||
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| ```js | ||
| #!/usr/bin/env node /*error This file must have Unix linebreaks (LF).*/ | ||
| console.log("hello"); | ||
| // If this file has Windows' linebreaks (CRLF). | ||
| ``` | ||
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| The following patterns are considered problems for other files: | ||
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| ```js | ||
| #!/usr/bin/env node /*error This file needs no hashbang.*/ | ||
| console.log("hello"); | ||
| ``` | ||
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| The following patterns are not considered problems for files in `bin` field of `package.json`: | ||
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| ```js | ||
| #!/usr/bin/env node | ||
| console.log("hello"); | ||
| ``` | ||
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| The following patterns are not considered problems for other files: | ||
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| ```js | ||
| console.log("hello"); | ||
| ``` | ||
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| ### Options | ||
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| ```json | ||
| { | ||
| "n/hashbang": ["error", { | ||
| "convertPath": null, | ||
| "ignoreUnpublished": false, | ||
| "additionalExecutables": [], | ||
| }] | ||
| } | ||
| ``` | ||
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| #### convertPath | ||
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| This can be configured in the rule options or as a shared setting [`settings.convertPath`](../shared-settings.md#convertpath). | ||
| Please see the shared settings documentation for more information. | ||
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| #### ignoreUnpublished | ||
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| Allow for files that are not published to npm to be ignored by this rule. | ||
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| #### additionalExecutables | ||
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| Mark files as executable that are not referenced by the package.json#bin property | ||
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| ## 🔎 Implementation | ||
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| - [Rule source](../../lib/rules/hashbang.js) | ||
| - [Test source](../../tests/lib/rules/hashbang.js) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,212 @@ | ||
| /** | ||
| * @author Toru Nagashima | ||
| * See LICENSE file in root directory for full license. | ||
| */ | ||
| "use strict" | ||
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| const path = require("path") | ||
| const matcher = require("ignore") | ||
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| const getConvertPath = require("../util/get-convert-path") | ||
| const getPackageJson = require("../util/get-package-json") | ||
| const getNpmignore = require("../util/get-npmignore") | ||
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| const NODE_SHEBANG = "#!/usr/bin/env node\n" | ||
| const SHEBANG_PATTERN = /^(#!.+?)?(\r)?\n/u | ||
| const NODE_SHEBANG_PATTERN = | ||
| /^#!\/usr\/bin\/env(?: -\S+)*(?: [^\s=-]+=\S+)* node(?: [^\r\n]+?)?\n/u | ||
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| function simulateNodeResolutionAlgorithm(filePath, binField) { | ||
| const possibilities = [filePath] | ||
| let newFilePath = filePath.replace(/\.js$/u, "") | ||
| possibilities.push(newFilePath) | ||
| newFilePath = newFilePath.replace(/[/\\]index$/u, "") | ||
| possibilities.push(newFilePath) | ||
| return possibilities.includes(binField) | ||
| } | ||
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| /** | ||
| * Checks whether or not a given path is a `bin` file. | ||
| * | ||
| * @param {string} filePath - A file path to check. | ||
| * @param {string|object|undefined} binField - A value of the `bin` field of `package.json`. | ||
| * @param {string} basedir - A directory path that `package.json` exists. | ||
| * @returns {boolean} `true` if the file is a `bin` file. | ||
| */ | ||
| function isBinFile(filePath, binField, basedir) { | ||
| if (!binField) { | ||
| return false | ||
| } | ||
| if (typeof binField === "string") { | ||
| return simulateNodeResolutionAlgorithm( | ||
| filePath, | ||
| path.resolve(basedir, binField) | ||
| ) | ||
| } | ||
| return Object.keys(binField).some(key => | ||
| simulateNodeResolutionAlgorithm( | ||
| filePath, | ||
| path.resolve(basedir, binField[key]) | ||
| ) | ||
| ) | ||
| } | ||
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| /** | ||
| * Gets the shebang line (includes a line ending) from a given code. | ||
| * | ||
| * @param {SourceCode} sourceCode - A source code object to check. | ||
| * @returns {{length: number, bom: boolean, shebang: string, cr: boolean}} | ||
| * shebang's information. | ||
| * `retv.shebang` is an empty string if shebang doesn't exist. | ||
| */ | ||
| function getShebangInfo(sourceCode) { | ||
| const m = SHEBANG_PATTERN.exec(sourceCode.text) | ||
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| return { | ||
| bom: sourceCode.hasBOM, | ||
| cr: Boolean(m && m[2]), | ||
| length: (m && m[0].length) || 0, | ||
| shebang: (m && m[1] && `${m[1]}\n`) || "", | ||
| } | ||
| } | ||
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| /** @type {import('eslint').Rule.RuleModule} */ | ||
| module.exports = { | ||
| meta: { | ||
| docs: { | ||
| description: "require correct usage of hashbang", | ||
| recommended: true, | ||
| url: "https://github.com/eslint-community/eslint-plugin-n/blob/HEAD/docs/rules/hashbang.md", | ||
| }, | ||
| type: "problem", | ||
| fixable: "code", | ||
| schema: [ | ||
| { | ||
| type: "object", | ||
| properties: { | ||
| convertPath: getConvertPath.schema, | ||
| ignoreUnpublished: { type: "boolean" }, | ||
| additionalExecutables: { | ||
| type: "array", | ||
| items: { type: "string" }, | ||
| }, | ||
| }, | ||
| additionalProperties: false, | ||
| }, | ||
| ], | ||
| messages: { | ||
| unexpectedBOM: "This file must not have Unicode BOM.", | ||
| expectedLF: "This file must have Unix linebreaks (LF).", | ||
| expectedHashbangNode: | ||
| 'This file needs shebang "#!/usr/bin/env node".', | ||
| expectedHashbang: "This file needs no shebang.", | ||
| }, | ||
| }, | ||
| create(context) { | ||
| const sourceCode = context.sourceCode ?? context.getSourceCode() // TODO: just use context.sourceCode when dropping eslint < v9 | ||
| const filePath = context.filename ?? context.getFilename() | ||
| if (filePath === "<input>") { | ||
| return {} | ||
| } | ||
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| const p = getPackageJson(filePath) | ||
| if (!p) { | ||
| return {} | ||
| } | ||
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| const packageDirectory = path.dirname(p.filePath) | ||
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| const originalAbsolutePath = path.resolve(filePath) | ||
| const originalRelativePath = path | ||
| .relative(packageDirectory, originalAbsolutePath) | ||
| .replace(/\\/gu, "/") | ||
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| const convertedRelativePath = | ||
| getConvertPath(context)(originalRelativePath) | ||
| const convertedAbsolutePath = path.resolve( | ||
| packageDirectory, | ||
| convertedRelativePath | ||
| ) | ||
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| const { additionalExecutables = [] } = context.options?.[0] ?? {} | ||
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| const executable = matcher() | ||
| executable.add(additionalExecutables) | ||
| const isExecutable = executable.test(convertedRelativePath) | ||
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| if ( | ||
| (additionalExecutables.length === 0 || | ||
| isExecutable.ignored === false) && | ||
| context.options?.[0]?.ignoreUnpublished === true | ||
| ) { | ||
| const npmignore = getNpmignore(convertedAbsolutePath) | ||
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| if (npmignore.match(convertedRelativePath)) { | ||
| return {} | ||
| } | ||
| } | ||
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| const needsShebang = | ||
| isExecutable.ignored === true || | ||
| isBinFile(convertedAbsolutePath, p.bin, packageDirectory) | ||
| const info = getShebangInfo(sourceCode) | ||
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| return { | ||
| Program() { | ||
| const loc = { | ||
| start: { line: 1, column: 0 }, | ||
| end: { line: 1, column: sourceCode.lines.at(0).length }, | ||
| } | ||
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| if ( | ||
| needsShebang | ||
| ? NODE_SHEBANG_PATTERN.test(info.shebang) | ||
| : !info.shebang | ||
| ) { | ||
| // Good the shebang target. | ||
| // Checks BOM and \r. | ||
| if (needsShebang && info.bom) { | ||
| context.report({ | ||
| loc, | ||
| messageId: "unexpectedBOM", | ||
| fix(fixer) { | ||
| return fixer.removeRange([-1, 0]) | ||
| }, | ||
| }) | ||
| } | ||
| if (needsShebang && info.cr) { | ||
| context.report({ | ||
| loc, | ||
| messageId: "expectedLF", | ||
| fix(fixer) { | ||
| const index = sourceCode.text.indexOf("\r") | ||
| return fixer.removeRange([index, index + 1]) | ||
| }, | ||
| }) | ||
| } | ||
| } else if (needsShebang) { | ||
| // Shebang is lacking. | ||
| context.report({ | ||
| loc, | ||
| messageId: "expectedHashbangNode", | ||
| fix(fixer) { | ||
| return fixer.replaceTextRange( | ||
| [-1, info.length], | ||
| NODE_SHEBANG | ||
| ) | ||
| }, | ||
| }) | ||
| } else { | ||
| // Shebang is extra. | ||
| context.report({ | ||
| loc, | ||
| messageId: "expectedHashbang", | ||
| fix(fixer) { | ||
| return fixer.removeRange([0, info.length]) | ||
| }, | ||
| }) | ||
| } | ||
| }, | ||
| } | ||
| }, | ||
| } |
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