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109 lines
3.0 KiB
109 lines
3.0 KiB
/**
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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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*
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* @format
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*/
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'use strict';
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/**
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* This FlowFixMe is supposed to refer to an InterfaceDeclaration or TypeAlias
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* declaration type. Unfortunately, we don't have those types, because flow-parser
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* generates them, and flow-parser is not type-safe. In the future, we should find
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* a way to get these types from our flow parser library.
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*
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* TODO(T71778680): Flow type AST Nodes
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*/
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function getTypes(ast) {
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return ast.body.reduce((types, node) => {
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if (node.type === 'ExportNamedDeclaration' && node.exportKind === 'type') {
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if (
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node.declaration != null &&
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(node.declaration.type === 'TypeAlias' ||
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node.declaration.type === 'InterfaceDeclaration')
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) {
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types[node.declaration.id.name] = node.declaration;
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}
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} else if (
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node.type === 'ExportNamedDeclaration' &&
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node.exportKind === 'value' &&
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node.declaration &&
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node.declaration.type === 'EnumDeclaration'
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) {
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types[node.declaration.id.name] = node.declaration;
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} else if (
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node.type === 'TypeAlias' ||
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node.type === 'InterfaceDeclaration' ||
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node.type === 'EnumDeclaration'
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) {
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types[node.id.name] = node;
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}
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return types;
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}, {});
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}
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// $FlowFixMe[unclear-type] there's no flowtype for ASTs
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const invariant = require('invariant');
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function resolveTypeAnnotation(
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// TODO(T71778680): This is an Flow TypeAnnotation. Flow-type this
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typeAnnotation,
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types,
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) {
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invariant(
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typeAnnotation != null,
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'resolveTypeAnnotation(): typeAnnotation cannot be null',
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);
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let node = typeAnnotation;
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let nullable = false;
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let typeAliasResolutionStatus = {
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successful: false,
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};
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for (;;) {
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if (node.type === 'NullableTypeAnnotation') {
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nullable = true;
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node = node.typeAnnotation;
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} else if (node.type === 'GenericTypeAnnotation') {
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typeAliasResolutionStatus = {
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successful: true,
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aliasName: node.id.name,
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};
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const resolvedTypeAnnotation = types[node.id.name];
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if (
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resolvedTypeAnnotation == null ||
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resolvedTypeAnnotation.type === 'EnumDeclaration'
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) {
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break;
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}
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invariant(
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resolvedTypeAnnotation.type === 'TypeAlias',
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`GenericTypeAnnotation '${node.id.name}' must resolve to a TypeAlias. Instead, it resolved to a '${resolvedTypeAnnotation.type}'`,
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);
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node = resolvedTypeAnnotation.right;
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} else {
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break;
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}
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}
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return {
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nullable: nullable,
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typeAnnotation: node,
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typeAliasResolutionStatus,
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};
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}
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function getValueFromTypes(value, types) {
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if (value.type === 'GenericTypeAnnotation' && types[value.id.name]) {
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return getValueFromTypes(types[value.id.name].right, types);
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}
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return value;
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}
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module.exports = {
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getValueFromTypes,
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resolveTypeAnnotation,
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getTypes,
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};
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