[Fix] exportMap: improve cacheKey when using flat config
#3072
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Note: I broke the change to |
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ljharb
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Discovered this issue in import-js#2996 (comment) This change improves the logic for generating the cache key used for both the exportMap cache and resolver cache when using flat config. Prior to this change, the cache key was a combination of the `parserPath`, a hash of the `parserOptions`, a hash of the plugin settings, and the path of the file. When using flat config, `parserPath` isn't provided. So, there's the possibility of incorrect cache objects being used if someone ran with this plugin using different parsers within the same lint execution, if parserOptions and settings are the same. The equivalent cacheKey construction when using flat config is to use `languageOptions` as a component of the key, rather than `parserPath` and `parserOptions`. One caveat is that the `parser` property of `languageOptions` is an object that oftentimes has the same two functions (`parse` and `parseForESLint`). This won't be reliably distinct when using the base JSON.stringify function to detect changes. So, this implementation uses a replace function along with `JSON.stringify` to stringify function properties along with other property types. To ensure that this will work properly with v9, I also tested this against import-js#2996 with v9 installed. Not only does it pass all tests in that branch, but it also removes the need to add this exception: import-js#2996 (comment)
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Published v2.12.0 of eslint-module-utils already; this PR will be merged once CI passes. |
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exportMap: improve cacheKey when using flat config
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| datasource | package | from | to | | ---------- | -------------------- | ------ | ------ | | npm | eslint-plugin-import | 2.30.0 | 2.31.0 | ## [v2.31.0](https://github.com/import-js/eslint-plugin-import/blob/HEAD/CHANGELOG.md#2310---2024-10-03) ##### Added - support eslint v9 (\[[#2996](import-js/eslint-plugin-import#2996)], thanks \[[@G-Rath](https://github.com/G-Rath)] \[[@michaelfaith](https://github.com/michaelfaith)]) - \[`order`]: allow validating named imports (\[[#3043](import-js/eslint-plugin-import#3043)], thanks \[[@manuth](https://github.com/manuth)]) - \[`extensions`]: add the `checkTypeImports` option (\[[#2817](import-js/eslint-plugin-import#2817)], thanks \[[@phryneas](https://github.com/phryneas)]) ##### Fixed - `ExportMap` / flat config: include `languageOptions` in context (\[[#3052](import-js/eslint-plugin-import#3052)], thanks \[[@michaelfaith](https://github.com/michaelfaith)]) - \[`no-named-as-default`]: Allow using an identifier if the export is both a named and a default export (\[[#3032](import-js/eslint-plugin-import#3032)], thanks \[[@akwodkiewicz](https://github.com/akwodkiewicz)]) - \[`export`]: False positive for exported overloaded functions in TS (\[[#3065](import-js/eslint-plugin-import#3065)], thanks \[[@liuxingbaoyu](https://github.com/liuxingbaoyu)]) - `exportMap`: export map cache is tainted by unreliable parse results (\[[#3062](import-js/eslint-plugin-import#3062)], thanks \[[@michaelfaith](https://github.com/michaelfaith)]) - `exportMap`: improve cacheKey when using flat config (\[[#3072](import-js/eslint-plugin-import#3072)], thanks \[[@michaelfaith](https://github.com/michaelfaith)]) - adjust "is source type module" checks for flat config (\[[#2996](import-js/eslint-plugin-import#2996)], thanks \[[@G-Rath](https://github.com/G-Rath)]) ##### Changed - \[Docs] \[`no-relative-packages`]: fix typo (\[[#3066](import-js/eslint-plugin-import#3066)], thanks \[[@joshuaobrien](https://github.com/joshuaobrien)]) - \[Performance] \[`no-cycle`]: dont scc for each linted file (\[[#3068](import-js/eslint-plugin-import#3068)], thanks \[[@soryy708](https://github.com/soryy708)]) - \[Docs] \[`no-cycle`]: add `disableScc` to docs (\[[#3070](import-js/eslint-plugin-import#3070)], thanks \[[@soryy708](https://github.com/soryy708)]) - \[Tests] use re-exported `RuleTester` (\[[#3071](import-js/eslint-plugin-import#3071)], thanks \[[@G-Rath](https://github.com/G-Rath)]) - \[Docs] \[`no-restricted-paths`]: fix grammar (\[[#3073](import-js/eslint-plugin-import#3073)], thanks \[[@unbeauvoyage](https://github.com/unbeauvoyage)]) - \[Tests] \[`no-default-export`], \[`no-named-export`]: add test case (thanks \[[@G-Rath](https://github.com/G-Rath)])
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| datasource | package | from | to | | ---------- | -------------------- | ------ | ------ | | npm | eslint-plugin-import | 2.30.0 | 2.31.0 | ## [v2.31.0](https://github.com/import-js/eslint-plugin-import/blob/HEAD/CHANGELOG.md#2310---2024-10-03) ##### Added - support eslint v9 (\[[#2996](import-js/eslint-plugin-import#2996)], thanks \[[@G-Rath](https://github.com/G-Rath)] \[[@michaelfaith](https://github.com/michaelfaith)]) - \[`order`]: allow validating named imports (\[[#3043](import-js/eslint-plugin-import#3043)], thanks \[[@manuth](https://github.com/manuth)]) - \[`extensions`]: add the `checkTypeImports` option (\[[#2817](import-js/eslint-plugin-import#2817)], thanks \[[@phryneas](https://github.com/phryneas)]) ##### Fixed - `ExportMap` / flat config: include `languageOptions` in context (\[[#3052](import-js/eslint-plugin-import#3052)], thanks \[[@michaelfaith](https://github.com/michaelfaith)]) - \[`no-named-as-default`]: Allow using an identifier if the export is both a named and a default export (\[[#3032](import-js/eslint-plugin-import#3032)], thanks \[[@akwodkiewicz](https://github.com/akwodkiewicz)]) - \[`export`]: False positive for exported overloaded functions in TS (\[[#3065](import-js/eslint-plugin-import#3065)], thanks \[[@liuxingbaoyu](https://github.com/liuxingbaoyu)]) - `exportMap`: export map cache is tainted by unreliable parse results (\[[#3062](import-js/eslint-plugin-import#3062)], thanks \[[@michaelfaith](https://github.com/michaelfaith)]) - `exportMap`: improve cacheKey when using flat config (\[[#3072](import-js/eslint-plugin-import#3072)], thanks \[[@michaelfaith](https://github.com/michaelfaith)]) - adjust "is source type module" checks for flat config (\[[#2996](import-js/eslint-plugin-import#2996)], thanks \[[@G-Rath](https://github.com/G-Rath)]) ##### Changed - \[Docs] \[`no-relative-packages`]: fix typo (\[[#3066](import-js/eslint-plugin-import#3066)], thanks \[[@joshuaobrien](https://github.com/joshuaobrien)]) - \[Performance] \[`no-cycle`]: dont scc for each linted file (\[[#3068](import-js/eslint-plugin-import#3068)], thanks \[[@soryy708](https://github.com/soryy708)]) - \[Docs] \[`no-cycle`]: add `disableScc` to docs (\[[#3070](import-js/eslint-plugin-import#3070)], thanks \[[@soryy708](https://github.com/soryy708)]) - \[Tests] use re-exported `RuleTester` (\[[#3071](import-js/eslint-plugin-import#3071)], thanks \[[@G-Rath](https://github.com/G-Rath)]) - \[Docs] \[`no-restricted-paths`]: fix grammar (\[[#3073](import-js/eslint-plugin-import#3073)], thanks \[[@unbeauvoyage](https://github.com/unbeauvoyage)]) - \[Tests] \[`no-default-export`], \[`no-named-export`]: add test case (thanks \[[@G-Rath](https://github.com/G-Rath)])
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Discovered this issue in #2996 (comment).
This change improves the logic for generating the cache key used for both the ExportMap cache and the resolver cache when using flat config. Prior to this change, the cache key was a combination of the
parserPath, a hash of theparserOptions, a hash of the plugin settings, and the path of the file. When using flat config,parserPathisn't provided. So, there's the possibility of incorrect / stale cache objects being used if someone ran with this plugin using different parsers within the same lint execution, ifparserOptionsand settings are the same.For flat config, we can achieve similar results by constructing the cacheKey using
languageOptionsas a component of the key, rather thanparserPathandparserOptions. One caveat is that theparserproperty oflanguageOptionsis an object that oftentimes has the same two functions (parseandparseForESLint). This won't be reliably distinct when using the baseJSON.stringifyfunction to detect changes. So, this implementation uses a replacer function along withJSON.stringifyto stringify function properties along with other property types in order to detect different parsers.To ensure that this works properly with v9, I also tested this against #2996 with v9 installed. Not only does it pass all tests in that branch, but it also removes the need to add this exception: #2996 (comment)