37 lines
1.4 KiB
TypeScript
37 lines
1.4 KiB
TypeScript
import * as ts from "typescript";
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// Custom Typescript AST transformer for use with ts-jest / jest-preset-angular
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// Removes specified ES2020 syntax from source code, as node does not support it yet
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// Reference: https://kulshekhar.github.io/ts-jest/docs/getting-started/options/astTransformers
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// Use this tool to understand how we identify and filter AST nodes: https://ts-ast-viewer.com/
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/**
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* Remember to increase the version whenever transformer's content is changed. This is to inform Jest to not reuse
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* the previous cache which contains old transformer's content
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*/
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export const version = 1;
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export const name = "bit-es2020-transformer";
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// Returns true for 'import.meta' statements
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const isImportMetaStatement = (node: ts.Node) =>
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ts.isPropertyAccessExpression(node) &&
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ts.isMetaProperty(node.expression) &&
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node.expression.keywordToken === ts.SyntaxKind.ImportKeyword;
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export const factory = function (/*opts?: Opts*/) {
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function visitor(ctx: ts.TransformationContext, sf: ts.SourceFile) {
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const visitor: ts.Visitor = (node: ts.Node): ts.VisitResult<any> => {
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if (isImportMetaStatement(node)) {
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return null;
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}
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// Continue searching child nodes
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return ts.visitEachChild(node, visitor, ctx);
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};
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return visitor;
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}
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return (ctx: ts.TransformationContext): ts.Transformer<any> => {
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return (sf: ts.SourceFile) => ts.visitNode(sf, visitor(ctx, sf));
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};
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};
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