159 lines
4.1 KiB
Plaintext
159 lines
4.1 KiB
Plaintext
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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* @format
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*/
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/**
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* This transform strips all Flow types.
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*
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* It is expected that all transforms create valid ESTree AST output. If
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* the transform requires outputting Babel specific AST nodes then it
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* should live in `ConvertESTreeToBabel.js`
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*/
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'use strict';
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import type {ParserOptions} from '../ParserOptions';
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import type {Program, ESNode} from 'hermes-estree';
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import {SimpleTransform} from '../transform/SimpleTransform';
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const nodeWith = SimpleTransform.nodeWith;
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export function transformProgram(
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program: Program,
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_options: ParserOptions,
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): Program {
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return SimpleTransform.transformProgram(program, {
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transform(node: ESNode) {
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switch (node.type) {
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case 'AsExpression':
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case 'AsConstExpression':
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case 'TypeCastExpression': {
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return node.expression;
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}
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case 'CallExpression':
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case 'NewExpression': {
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if (node.typeArguments != null) {
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return nodeWith(node, {typeArguments: null});
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}
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return node;
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}
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case 'ObjectPattern':
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case 'ArrayPattern':
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case 'Identifier': {
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if (node.typeAnnotation != null) {
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return nodeWith(node, {typeAnnotation: null});
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}
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return node;
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}
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case 'DeclareClass':
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case 'DeclareFunction':
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case 'DeclareInterface':
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case 'DeclareModule':
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case 'DeclareModuleExports':
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case 'DeclareNamespace':
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case 'DeclareOpaqueType':
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case 'DeclareTypeAlias':
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case 'DeclareVariable':
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case 'InterfaceDeclaration':
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case 'OpaqueType':
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case 'TypeAlias': {
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return null;
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}
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case 'FunctionDeclaration':
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case 'ArrowFunctionExpression':
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case 'FunctionExpression': {
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const newParams = [];
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for (let i = 0; i < node.params.length; i++) {
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if (
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i === 0 &&
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node.params[0].type === 'Identifier' &&
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node.params[0].name === 'this'
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) {
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continue;
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}
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let param = node.params[i];
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if (param.type === 'AssignmentPattern') {
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param = param.left;
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}
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if (param.optional === true) {
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param = nodeWith(param, {optional: false});
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}
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newParams.push(param);
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}
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return nodeWith(node, {
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params: newParams,
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returnType: null,
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typeParameters: null,
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predicate: null,
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});
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}
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case 'ClassDeclaration':
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case 'ClassExpression': {
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return nodeWith(node, {
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typeParameters: null,
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superTypeParameters: null,
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implements: [],
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decorators: [],
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});
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}
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case 'PropertyDefinition': {
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return nodeWith(node, {
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typeAnnotation: null,
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variance: null,
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declare: false,
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optional: false,
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});
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}
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case 'ImportDeclaration': {
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if (node.importKind === 'type' || node.importKind === 'typeof') {
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return null;
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}
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const nonTypeSpecifiers = node.specifiers.filter(
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s =>
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s.type !== 'ImportSpecifier' ||
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(s.importKind !== 'type' && s.importKind !== 'typeof'),
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);
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if (nonTypeSpecifiers.length === 0) {
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return null;
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}
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if (nonTypeSpecifiers.length === node.specifiers.length) {
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return node;
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}
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return nodeWith(node, {
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specifiers: nonTypeSpecifiers,
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});
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}
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case 'ExportAllDeclaration':
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case 'ExportNamedDeclaration': {
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if (node.exportKind === 'type') {
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return null;
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}
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return node;
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}
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default: {
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return node;
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}
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}
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},
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});
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}
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