@angular-devkit/build-angular
Version:
Angular Webpack Build Facade
114 lines • 15.1 kB
JavaScript
"use strict";
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.getKeywords = void 0;
const core_1 = require("@babel/core");
const helper_annotate_as_pure_1 = __importDefault(require("@babel/helper-annotate-as-pure"));
/**
* Provides one or more keywords that if found within the content of a source file indicate
* that this plugin should be used with a source file.
*
* @returns An a string iterable containing one or more keywords.
*/
function getKeywords() {
return ['var'];
}
exports.getKeywords = getKeywords;
/**
* A babel plugin factory function for adjusting TypeScript emitted enums.
*
* @returns A babel plugin object instance.
*/
function default_1() {
return {
visitor: {
VariableDeclaration(path) {
const { parentPath, node } = path;
if (node.kind !== 'var' || node.declarations.length !== 1) {
return;
}
const declaration = path.get('declarations')[0];
if (declaration.node.init) {
return;
}
const declarationId = declaration.node.id;
if (!core_1.types.isIdentifier(declarationId)) {
return;
}
const hasExport = parentPath.isExportNamedDeclaration() || parentPath.isExportDefaultDeclaration();
const origin = hasExport ? parentPath : path;
const nextStatement = origin.getSibling(+origin.key + 1);
if (!nextStatement.isExpressionStatement()) {
return;
}
const nextExpression = nextStatement.get('expression');
if (!nextExpression.isCallExpression() || nextExpression.node.arguments.length !== 1) {
return;
}
const enumCallArgument = nextExpression.get('arguments')[0];
if (!enumCallArgument.isLogicalExpression({ operator: '||' })) {
return;
}
const leftCallArgument = enumCallArgument.get('left');
const rightCallArgument = enumCallArgument.get('right');
// Check if identifiers match var declaration
if (!leftCallArgument.isIdentifier() ||
!nextExpression.scope.bindingIdentifierEquals(leftCallArgument.node.name, declarationId) ||
!rightCallArgument.isAssignmentExpression()) {
return;
}
const enumCallee = nextExpression.get('callee');
if (!enumCallee.isFunctionExpression() || enumCallee.node.params.length !== 1) {
return;
}
const parameterId = enumCallee.get('params')[0];
if (!parameterId.isIdentifier()) {
return;
}
// Check if all enum member values are pure.
// If not, leave as-is due to potential side efects
let hasElements = false;
for (const enumStatement of enumCallee.get('body').get('body')) {
if (!enumStatement.isExpressionStatement()) {
return;
}
const enumValueAssignment = enumStatement.get('expression');
if (!enumValueAssignment.isAssignmentExpression() ||
!enumValueAssignment.get('right').isPure()) {
return;
}
hasElements = true;
}
// If there are no enum elements then there is nothing to wrap
if (!hasElements) {
return;
}
// Update right-side of initializer call argument to remove redundant assignment
if (rightCallArgument.get('left').isIdentifier()) {
rightCallArgument.replaceWith(rightCallArgument.get('right'));
}
// Add a return statement to the enum initializer block
enumCallee
.get('body')
.node.body.push(core_1.types.returnStatement(core_1.types.cloneNode(parameterId.node)));
// Remove existing enum initializer
const enumInitializer = nextExpression.node;
nextExpression.remove();
(0, helper_annotate_as_pure_1.default)(enumInitializer);
// Add the wrapped enum initializer directly to the variable declaration
declaration.get('init').replaceWith(enumInitializer);
},
},
};
}
exports.default = default_1;
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parentPath : path;\n        const nextStatement = origin.getSibling(+origin.key + 1);\n        if (!nextStatement.isExpressionStatement()) {\n          return;\n        }\n\n        const nextExpression = nextStatement.get('expression');\n        if (!nextExpression.isCallExpression() || nextExpression.node.arguments.length !== 1) {\n          return;\n        }\n\n        const enumCallArgument = nextExpression.get('arguments')[0];\n        if (!enumCallArgument.isLogicalExpression({ operator: '||' })) {\n          return;\n        }\n\n        const leftCallArgument = enumCallArgument.get('left');\n        const rightCallArgument = enumCallArgument.get('right');\n\n        // Check if identifiers match var declaration\n        if (\n          !leftCallArgument.isIdentifier() ||\n          !nextExpression.scope.bindingIdentifierEquals(\n            leftCallArgument.node.name,\n            declarationId,\n          ) ||\n          !rightCallArgument.isAssignmentExpression()\n        ) {\n          return;\n        }\n\n        const enumCallee = nextExpression.get('callee');\n        if (!enumCallee.isFunctionExpression() || enumCallee.node.params.length !== 1) {\n          return;\n        }\n\n        const parameterId = enumCallee.get('params')[0];\n        if (!parameterId.isIdentifier()) {\n          return;\n        }\n\n        // Check if all enum member values are pure.\n        // If not, leave as-is due to potential side efects\n        let hasElements = false;\n        for (const enumStatement of enumCallee.get('body').get('body')) {\n          if (!enumStatement.isExpressionStatement()) {\n            return;\n          }\n\n          const enumValueAssignment = enumStatement.get('expression');\n          if (\n            !enumValueAssignment.isAssignmentExpression() ||\n            !enumValueAssignment.get('right').isPure()\n          ) {\n            return;\n          }\n\n          hasElements = true;\n        }\n\n        // If there are no enum elements then there is nothing to wrap\n        if (!hasElements) {\n          return;\n        }\n\n        // Update right-side of initializer call argument to remove redundant assignment\n        if (rightCallArgument.get('left').isIdentifier()) {\n          rightCallArgument.replaceWith(rightCallArgument.get('right'));\n        }\n\n        // Add a return statement to the enum initializer block\n        enumCallee\n          .get('body')\n          .node.body.push(types.returnStatement(types.cloneNode(parameterId.node)));\n\n        // Remove existing enum initializer\n        const enumInitializer = nextExpression.node;\n        nextExpression.remove();\n\n        annotateAsPure(enumInitializer);\n\n        // Add the wrapped enum initializer directly to the variable declaration\n        declaration.get('init').replaceWith(enumInitializer);\n      },\n    },\n  };\n}\n"]}