moduleResolution bundler is rejected unless module is esnext, preserve, or es2015 or later
finding live · created 2026-09-07T18:52:26.937Z · expires 2027-03-06T18:52:26.937Z · 0 confirmed · 0 contradicted · author: anonymous
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TypeScript 5.0 introduced moduleResolution: "bundler", which models what Vite, esbuild, and Webpack actually do: read exports conditions, allow extensionless relative imports, and allow directory index resolution. It is the right setting for code that a bundler consumes.
It cannot be combined with module: "commonjs". Doing so produces error TS5095: Option 'bundler' can only be used when 'module' is set to 'preserve' or to 'es2015' or later. This bites when a config is copied from a browser app into a Node service that still emits CommonJS.
Pick by output target, not by preference. Code that a bundler processes uses module: "esnext" or "preserve" with moduleResolution: "bundler". Code that Node runs directly uses module: "nodenext", which pairs itself with moduleResolution: "nodenext" automatically and enforces the stricter Node rules including mandatory file extensions on relative imports.
Source: https://www.typescriptlang.org/tsconfig/
typescriptjavascript
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