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13 KiB
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{"version":3,"names":["DefineAccessorHelper","template","expression","ast","_compact","declare","api","options","assertVersion","setComputedProperties","assumption","loose","pushComputedProps","pushComputedPropsLoose","pushComputedPropsSpec","buildDefineAccessor","state","type","obj","key","fn","helper","availableHelper","addHelper","file","get","id","scope","generateUidIdentifier","push","init","set","t","cloneNode","callExpression","stringLiteral","getValue","prop","isObjectProperty","value","isObjectMethod","functionExpression","params","body","generator","async","pushAssign","objId","expressionStatement","assignmentExpression","memberExpression","computed","isLiteral","pushAccessorDefine","computedProps","initPropExpression","kind","isIdentifier","name","length","info","single","toComputedKey","visitor","ObjectExpression","exit","path","node","parent","hasComputed","properties","initProps","foundComputed","isSpreadElement","generateUidIdentifierBasedOnNode","objectExpression","variableDeclaration","variableDeclarator","replaceWith","replaceWithMultiple"],"sources":["../src/index.ts"],"sourcesContent":["import { types as t } from \"@babel/core\";\nimport type { PluginPass } from \"@babel/core\";\nimport { declare } from \"@babel/helper-plugin-utils\";\nimport template from \"@babel/template\";\nimport type { Scope } from \"@babel/traverse\";\n\nexport interface Options {\n loose?: boolean;\n}\n\ntype PropertyInfo = {\n scope: Scope;\n objId: t.Identifier;\n body: t.Statement[];\n computedProps: t.ObjectMember[];\n initPropExpression: t.ObjectExpression;\n state: PluginPass;\n};\n\n// TODO(Babel 8): Remove this\nconst DefineAccessorHelper = template.expression.ast`\nfunction (type, obj, key, fn) {\n var desc = { configurable: true, enumerable: true };\n desc[type] = fn;\n return Object.defineProperty(obj, key, desc);\n}`;\n// @ts-expect-error undocumented _compact node property\nDefineAccessorHelper._compact = true;\n\nexport default declare((api, options: Options) => {\n api.assertVersion(7);\n\n const setComputedProperties =\n api.assumption(\"setComputedProperties\") ?? options.loose;\n\n const pushComputedProps = setComputedProperties\n ? pushComputedPropsLoose\n : pushComputedPropsSpec;\n\n function buildDefineAccessor(\n state: PluginPass,\n type: \"get\" | \"set\",\n obj: t.Expression,\n key: t.Expression,\n fn: t.Expression,\n ) {\n let helper: t.Identifier;\n if (state.availableHelper(\"defineAccessor\")) {\n helper = state.addHelper(\"defineAccessor\");\n } else {\n // Fallback for @babel/helpers <= 7.20.6, manually add helper function\n // TODO(Babel 8): Remove this\n const file = state.file;\n helper = file.get(\"fallbackDefineAccessorHelper\");\n if (!helper) {\n const id = file.scope.generateUidIdentifier(\"defineAccessor\");\n file.scope.push({\n id,\n init: DefineAccessorHelper,\n });\n file.set(\"fallbackDefineAccessorHelper\", (helper = id));\n }\n helper = t.cloneNode(helper);\n }\n\n return t.callExpression(helper, [t.stringLiteral(type), obj, key, fn]);\n }\n\n /**\n * Get value of an object member under object expression.\n * Returns a function expression if prop is a ObjectMethod.\n *\n * @param {t.ObjectMember} prop\n * @returns t.Expression\n */\n function getValue(prop: t.ObjectMember) {\n if (t.isObjectProperty(prop)) {\n return prop.value as t.Expression;\n } else if (t.isObjectMethod(prop)) {\n return t.functionExpression(\n null,\n prop.params,\n prop.body,\n prop.generator,\n prop.async,\n );\n }\n }\n\n function pushAssign(\n objId: t.Identifier,\n prop: t.ObjectMember,\n body: t.Statement[],\n ) {\n body.push(\n t.expressionStatement(\n t.assignmentExpression(\n \"=\",\n t.memberExpression(\n t.cloneNode(objId),\n prop.key,\n prop.computed || t.isLiteral(prop.key),\n ),\n getValue(prop),\n ),\n ),\n );\n }\n\n function pushAccessorDefine(\n { body, computedProps, initPropExpression, objId, state }: PropertyInfo,\n prop: t.ObjectMethod,\n ) {\n const kind = prop.kind as \"get\" | \"set\";\n const key =\n !prop.computed && t.isIdentifier(prop.key)\n ? t.stringLiteral(prop.key.name)\n : prop.key;\n const value = getValue(prop);\n\n if (computedProps.length === 1) {\n return buildDefineAccessor(state, kind, initPropExpression, key, value);\n } else {\n body.push(\n t.expressionStatement(\n buildDefineAccessor(state, kind, t.cloneNode(objId), key, value),\n ),\n );\n }\n }\n\n function pushComputedPropsLoose(info: PropertyInfo) {\n for (const prop of info.computedProps) {\n if (\n t.isObjectMethod(prop) &&\n (prop.kind === \"get\" || prop.kind === \"set\")\n ) {\n const single = pushAccessorDefine(info, prop);\n if (single) return single;\n } else {\n pushAssign(t.cloneNode(info.objId), prop, info.body);\n }\n }\n }\n\n function pushComputedPropsSpec(info: PropertyInfo) {\n const { objId, body, computedProps, state } = info;\n\n for (const prop of computedProps) {\n // PrivateName must not be in ObjectExpression\n const key = t.toComputedKey(prop) as t.Expression;\n\n if (\n t.isObjectMethod(prop) &&\n (prop.kind === \"get\" || prop.kind === \"set\")\n ) {\n const single = pushAccessorDefine(info, prop);\n if (single) return single;\n } else {\n // the value of ObjectProperty in ObjectExpression must be an expression\n const value = getValue(prop);\n if (computedProps.length === 1) {\n return t.callExpression(state.addHelper(\"defineProperty\"), [\n info.initPropExpression,\n key,\n value,\n ]);\n } else {\n body.push(\n t.expressionStatement(\n t.callExpression(state.addHelper(\"defineProperty\"), [\n t.cloneNode(objId),\n key,\n value,\n ]),\n ),\n );\n }\n }\n }\n }\n\n return {\n name: \"transform-computed-properties\",\n\n visitor: {\n ObjectExpression: {\n exit(path, state) {\n const { node, parent, scope } = path;\n let hasComputed = false;\n for (const prop of node.properties) {\n // @ts-expect-error SpreadElement must not have computed property\n hasComputed = prop.computed === true;\n if (hasComputed) break;\n }\n if (!hasComputed) return;\n\n // put all getters/setters into the first object expression as well as all initialisers up\n // to the first computed property\n\n const initProps: t.ObjectMember[] = [];\n const computedProps: t.ObjectMember[] = [];\n let foundComputed = false;\n\n for (const prop of node.properties) {\n if (t.isSpreadElement(prop)) {\n continue;\n }\n if (prop.computed) {\n foundComputed = true;\n }\n\n if (foundComputed) {\n computedProps.push(prop);\n } else {\n initProps.push(prop);\n }\n }\n\n const objId = scope.generateUidIdentifierBasedOnNode(parent);\n const initPropExpression = t.objectExpression(initProps);\n const body = [];\n\n body.push(\n t.variableDeclaration(\"var\", [\n t.variableDeclarator(objId, initPropExpression),\n ]),\n );\n\n const single = pushComputedProps({\n scope,\n objId,\n body,\n computedProps,\n initPropExpression,\n state,\n });\n\n if (single) {\n path.replaceWith(single);\n } else {\n body.push(t.expressionStatement(t.cloneNode(objId)));\n path.replaceWithMultiple(body);\n }\n },\n },\n },\n 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