Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/** @import { FunctionExpression, FunctionDeclaration } from 'estree' */
import { walk } from 'zimmerframe';
import * as b from '../../utils/builders.js';
import * as e from '../../errors.js';
/**
* @param {FunctionExpression | FunctionDeclaration} node
* @param {Context<any, any>} context
*/
function remove_this_param(node, context) {
if (node.params[0]?.type === 'Identifier' && node.params[0].name === 'this') {
node.params.shift();
}
return context.next();
}
/** @type {Visitors<any, null>} */
const visitors = {
Decorator(node) {
e.typescript_invalid_feature(node, 'decorators (related TSC proposal is not stage 4 yet)');
},
ImportDeclaration(node) {
if (node.importKind === 'type') return b.empty;
if (node.specifiers?.length > 0) {
const specifiers = node.specifiers.filter((/** @type {any} */ s) => s.importKind !== 'type');
if (specifiers.length === 0) return b.empty;
return { ...node, specifiers };
}
return node;
},
ExportNamedDeclaration(node, context) {
if (node.exportKind === 'type') return b.empty;
if (node.declaration) {
return context.next();
}
if (node.specifiers) {
const specifiers = node.specifiers.filter((/** @type {any} */ s) => s.exportKind !== 'type');
if (specifiers.length === 0) return b.empty;
return { ...node, specifiers };
}
return node;
},
ExportDefaultDeclaration(node) {
if (node.exportKind === 'type') return b.empty;
return node;
},
ExportAllDeclaration(node) {
if (node.exportKind === 'type') return b.empty;
return node;
},
PropertyDefinition(node) {
if (node.accessor) {
e.typescript_invalid_feature(
node,
'accessor fields (related TSC proposal is not stage 4 yet)'
);
}
},
TSAsExpression(node, context) {
return context.visit(node.expression);
},
TSSatisfiesExpression(node, context) {
return context.visit(node.expression);
},
TSNonNullExpression(node, context) {
return context.visit(node.expression);
},
TSTypeAnnotation() {
// This isn't correct, strictly speaking, and could result in invalid ASTs (like an empty statement within function parameters),
// but esrap, our printing tool, just ignores these AST nodes at invalid positions, so it's fine
return b.empty;
},
TSInterfaceDeclaration() {
return b.empty;
},
TSTypeAliasDeclaration() {
return b.empty;
},
TSTypeParameterDeclaration() {
return b.empty;
},
TSTypeParameterInstantiation() {
return b.empty;
},
TSEnumDeclaration(node) {
e.typescript_invalid_feature(node, 'enums');
},
TSParameterProperty(node, context) {
if (node.accessibility && context.path.at(-2)?.kind === 'constructor') {
e.typescript_invalid_feature(node, 'accessibility modifiers on constructor parameters');
}
return node.parameter;
},
FunctionExpression: remove_this_param,
FunctionDeclaration: remove_this_param,
TSDeclareFunction() {
return b.empty;
},
ClassDeclaration(node, context) {
if (node.declare) {
return b.empty;
}
return context.next();
},
VariableDeclaration(node, context) {
if (node.declare) {
return b.empty;
}
return context.next();
},
TSModuleDeclaration(node, context) {
if (!node.body) return b.empty;
// namespaces can contain non-type nodes
const cleaned = /** @type {any[]} */ (node.body.body).map((entry) => context.visit(entry));
if (cleaned.some((entry) => entry !== b.empty)) {
e.typescript_invalid_feature(node, 'namespaces with non-type nodes');
}
return b.empty;
}
};
/**
* @template T
* @param {T} ast
* @returns {T}
*/
export function remove_typescript_nodes(ast) {
return walk(ast, null, visitors);
}
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