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14 KiB
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{"version":3,"names":["FEATURES","Object","freeze","fields","privateMethods","decorators","privateIn","staticBlocks","featuresSameLoose","Map","featuresKey","looseKey","looseLowPriorityKey","enableFeature","file","feature","loose","hasFeature","canIgnoreLoose","set","get","setLoose","resolvedLoose","higherPriorityPluginName","mask","name","isLoose","Error","undefined","console","warn","shouldTransform","path","decoratorPath","publicFieldPath","privateFieldPath","privateMethodPath","staticBlockPath","hasOwnDecorators","node","el","isClassProperty","isClassPrivateProperty","isClassPrivateMethod","isStaticBlock","buildCodeFrameError"],"sources":["../src/features.ts"],"sourcesContent":["import type { File, types as t } from \"@babel/core\";\nimport type { NodePath } from \"@babel/traverse\";\nimport { hasOwnDecorators } from \"./decorators\";\n\nexport const FEATURES = Object.freeze({\n //classes: 1 << 0,\n fields: 1 << 1,\n privateMethods: 1 << 2,\n // TODO(Babel 8): Remove this\n decorators: 1 << 3,\n privateIn: 1 << 4,\n staticBlocks: 1 << 5,\n});\n\nconst featuresSameLoose = new Map([\n [FEATURES.fields, \"@babel/plugin-proposal-class-properties\"],\n [FEATURES.privateMethods, \"@babel/plugin-proposal-private-methods\"],\n [FEATURES.privateIn, \"@babel/plugin-proposal-private-property-in-object\"],\n]);\n\n// We can't use a symbol because this needs to always be the same, even if\n// this package isn't deduped by npm. e.g.\n// - node_modules/\n// - @babel/plugin-class-features\n// - @babel/plugin-proposal-decorators\n// - node_modules\n// - @babel-plugin-class-features\nconst featuresKey = \"@babel/plugin-class-features/featuresKey\";\nconst looseKey = \"@babel/plugin-class-features/looseKey\";\n\n// See https://github.com/babel/babel/issues/11622.\n// Since preset-env sets loose for the fields and private methods plugins, it can\n// cause conflicts with the loose mode set by an explicit plugin in the config.\n// To solve this problem, we ignore preset-env's loose mode if another plugin\n// explicitly sets it\n// The code to handle this logic doesn't check that \"low priority loose\" is always\n// the same. However, it is only set by the preset and not directly by users:\n// unless someone _wants_ to break it, it shouldn't be a problem.\nconst looseLowPriorityKey =\n \"@babel/plugin-class-features/looseLowPriorityKey/#__internal__@babel/preset-env__please-overwrite-loose-instead-of-throwing\";\n\nexport function enableFeature(file: File, feature: number, loose: boolean) {\n // We can't blindly enable the feature because, if it was already set,\n // \"loose\" can't be changed, so that\n // @babel/plugin-class-properties { loose: true }\n // @babel/plugin-class-properties { loose: false }\n // is transformed in loose mode.\n // We only enabled the feature if it was previously disabled.\n if (!hasFeature(file, feature) || canIgnoreLoose(file, feature)) {\n file.set(featuresKey, file.get(featuresKey) | feature);\n if (\n // @ts-expect-error comparing loose with internal private magic string\n loose ===\n \"#__internal__@babel/preset-env__prefer-true-but-false-is-ok-if-it-prevents-an-error\"\n ) {\n setLoose(file, feature, true);\n file.set(looseLowPriorityKey, file.get(looseLowPriorityKey) | feature);\n } else if (\n // @ts-expect-error comparing loose with internal private magic string\n loose ===\n \"#__internal__@babel/preset-env__prefer-false-but-true-is-ok-if-it-prevents-an-error\"\n ) {\n setLoose(file, feature, false);\n file.set(looseLowPriorityKey, file.get(looseLowPriorityKey) | feature);\n } else {\n setLoose(file, feature, loose);\n }\n }\n\n let resolvedLoose: boolean | undefined;\n let higherPriorityPluginName: string | undefined;\n\n for (const [mask, name] of featuresSameLoose) {\n if (!hasFeature(file, mask)) continue;\n\n const loose = isLoose(file, mask);\n\n if (canIgnoreLoose(file, mask)) {\n continue;\n } else if (resolvedLoose === !loose) {\n throw new Error(\n \"'loose' mode configuration must be the same for @babel/plugin-proposal-class-properties, \" +\n \"@babel/plugin-proposal-private-methods and \" +\n \"@babel/plugin-proposal-private-property-in-object (when they are enabled).\",\n );\n } else {\n resolvedLoose = loose;\n higherPriorityPluginName = name;\n }\n }\n\n if (resolvedLoose !== undefined) {\n for (const [mask, name] of featuresSameLoose) {\n if (hasFeature(file, mask) && isLoose(file, mask) !== resolvedLoose) {\n setLoose(file, mask, resolvedLoose);\n console.warn(\n `Though the \"loose\" option was set to \"${!resolvedLoose}\" in your @babel/preset-env ` +\n `config, it will not be used for ${name} since the \"loose\" mode option was set to ` +\n `\"${resolvedLoose}\" for ${higherPriorityPluginName}.\\nThe \"loose\" option must be the ` +\n `same for @babel/plugin-proposal-class-properties, @babel/plugin-proposal-private-methods ` +\n `and @babel/plugin-proposal-private-property-in-object (when they are enabled): you can ` +\n `silence this warning by explicitly adding\\n` +\n `\\t[\"${name}\", { \"loose\": ${resolvedLoose} }]\\n` +\n `to the \"plugins\" section of your Babel config.`,\n );\n }\n }\n }\n}\n\nfunction hasFeature(file: File, feature: number) {\n return !!(file.get(featuresKey) & feature);\n}\n\nexport function isLoose(file: File, feature: number) {\n return !!(file.get(looseKey) & feature);\n}\n\nfunction setLoose(file: File, feature: number, loose: boolean) {\n if (loose) file.set(looseKey, file.get(looseKey) | feature);\n else file.set(looseKey, file.get(looseKey) & ~feature);\n\n file.set(looseLowPriorityKey, file.get(looseLowPriorityKey) & ~feature);\n}\n\nfunction canIgnoreLoose(file: File, feature: number) {\n return !!(file.get(looseLowPriorityKey) & feature);\n}\n\nexport function shouldTransform(path: NodePath<t.Class>, file: File): boolean {\n let decoratorPath: NodePath<t.Decorator> | null = null;\n let publicFieldPath: NodePath<t.ClassProperty> | null = null;\n let privateFieldPath: NodePath<t.ClassPrivateProperty> | null = null;\n let privateMethodPath: NodePath<t.ClassPrivateMethod> | null = null;\n let staticBlockPath: NodePath<t.StaticBlock> | null = null;\n\n if (hasOwnDecorators(path.node)) {\n decoratorPath = path.get(\"decorators.0\");\n }\n for (const el of path.get(\"body.body\")) {\n if (!decoratorPath && hasOwnDecorators(el.node)) {\n decoratorPath = el.get(\"decorators.0\");\n }\n if (!publicFieldPath && el.isClassProperty()) {\n publicFieldPath = el;\n }\n if (!privateFieldPath && el.isClassPrivateProperty()) {\n privateFieldPath = el;\n }\n // NOTE: path.isClassPrivateMethod() it isn't supported in <7.2.0\n if (!privateMethodPath && el.isClassPrivateMethod?.()) {\n privateMethodPath = el;\n }\n if (!staticBlockPath && el.isStaticBlock?.()) {\n staticBlockPath = el;\n }\n }\n\n if (decoratorPath && privateFieldPath) {\n throw privateFieldPath.buildCodeFrameError(\n \"Private fields in decorated classes are not supported yet.\",\n );\n }\n if (decoratorPath && privateMethodPath) {\n throw privateMethodPath.buildCodeFrameError(\n \"Private methods in decorated classes are not supported yet.\",\n );\n }\n\n if (decoratorPath && !hasFeature(file, FEATURES.decorators)) {\n throw path.buildCodeFrameError(\n \"Decorators are not enabled.\" +\n \"\\nIf you are using \" +\n '[\"@babel/plugin-proposal-decorators\", { \"version\": \"legacy\" }], ' +\n 'make sure it comes *before* \"@babel/plugin-proposal-class-properties\" ' +\n \"and enable loose mode, like so:\\n\" +\n '\\t[\"@babel/plugin-proposal-decorators\", { \"version\": \"legacy\" }]\\n' +\n '\\t[\"@babel/plugin-proposal-class-properties\", { \"loose\": true }]',\n );\n }\n\n if (privateMethodPath && !hasFeature(file, FEATURES.privateMethods)) {\n throw privateMethodPath.buildCodeFrameError(\n \"Class private methods are not enabled. \" +\n \"Please add `@babel/plugin-proposal-private-methods` to your configuration.\",\n );\n }\n\n if (\n (publicFieldPath || privateFieldPath) &&\n !hasFeature(file, FEATURES.fields) &&\n // We want to allow enabling the private-methods plugin even without enabling\n // the class-properties plugin. Class fields will still be compiled in classes\n // that contain private methods.\n // This is already allowed with the other various class features plugins, but\n // it's because they can fallback to a transform separated from this helper.\n !hasFeature(file, FEATURES.privateMethods)\n ) {\n throw path.buildCodeFrameError(\n \"Class fields are not enabled. \" +\n \"Please add `@babel/plugin-proposal-class-properties` to your configuration.\",\n );\n }\n\n if (staticBlockPath && !hasFeature(file, FEATURES.staticBlocks)) {\n throw path.buildCodeFrameError(\n \"Static class blocks are not enabled. \" +\n \"Please add `@babel/plugin-proposal-class-static-block` to your configuration.\",\n );\n }\n\n if (decoratorPath || privateMethodPath || staticBlockPath) {\n // If one of those feature is used we know that its transform is\n // enabled, otherwise the previous checks throw.\n return true;\n }\n if (\n (publicFieldPath || privateFieldPath) &&\n hasFeature(file, FEATURES.fields)\n ) {\n 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