Use tsdown to bundle into ESM and CJS exports

[colinhemphill]

Summary

The API client was compiled with tsc but not bundled in a way that it could be properly consumed by an application without transpiling the dependency. In a Next.js project this would result in the failure Error [ERR_MODULE_NOT_FOUND]: Cannot find module.

Solution

I've migrated the project to use tsdown which is the modern iteration on the deprecated tsup bundler. Allows us to build and export ESM and CJS bundles with very little config.

Testing

I installed the new version in one of our internal projects using npm link and the app builds without transpilation.

[qodo-for-bitly]

CI Feedback 🧐

A test triggered by this PR failed. Here is an AI-generated analysis of the failure:

Action: build

Failed stage: Run npm ci [❌]

Failed test name: ""

Failure summary: The action failed during the dependency installation step npm ci with npm error code EUSAGE because package.json and package-lock.json are out of sync. - npm ci requires the lockfile to exactly match package.json, but the lockfile contains multiple mismatched versions (e.g. tsdown@0.15.12 vs required tsdown@0.22.3, cac@6.7.14 vs required cac@7.0.0, various rolldown packages). - The lockfile is also missing required entries (e.g. import-without-cache@0.4.0, @rolldown/binding-linux-ppc64-gnu@1.1.2, @types/jsesc@2.5.1, estree-walker@3.0.3, @types/estree@1.0.9). As a result, npm ci aborted and the job exited with code 1.

Relevant error logs: 1: ##[group]Runner Image Provisioner 2: Hosted Compute Agent ... 139: node-version: 22.x 140: check-latest: false 141: token: *** 142: package-manager-cache: true 143: ##[endgroup] 144: Found in cache @ /opt/hostedtoolcache/node/22.22.3/x64 145: ##[group]Environment details 146: node: v22.22.3 147: npm: 10.9.8 148: yarn: 1.22.22 149: ##[endgroup] 150: ##[group]Run npm ci 151: �[36;1mnpm ci�[0m 152: shell: /usr/bin/bash -e {0} 153: ##[endgroup] 154: npm error code EUSAGE 155: npm error 156: npm error `npm ci` can only install packages when your package.json and package-lock.json or npm-shrinkwrap.json are in sync. Please update your lock file with `npm install` before continuing. 157: npm error 158: npm error Invalid: lock file's tsdown@0.15.12 does not satisfy tsdown@0.22.3 159: npm error Invalid: lock file's cac@6.7.14 does not satisfy cac@7.0.0 160: npm error Invalid: lock file's hookable@5.5.3 does not satisfy hookable@6.1.1 161: npm error Missing: import-without-cache@0.4.0 from lock file 162: npm error Invalid: lock file's rolldown@1.0.0-beta.45 does not satisfy rolldown@1.1.2 163: npm error Invalid: lock file's rolldown-plugin-dts@0.17.8 does not satisfy rolldown-plugin-dts@0.26.0 164: npm error Invalid: lock file's @oxc-project/types@0.95.0 does not satisfy @oxc-project/types@0.137.0 165: npm error Invalid: lock file's @rolldown/binding-android-arm64@1.0.0-beta.45 does not satisfy @rolldown/binding-android-arm64@1.1.2 166: npm error Invalid: lock file's @rolldown/binding-darwin-arm64@1.0.0-beta.45 does not satisfy @rolldown/binding-darwin-arm64@1.1.2 167: npm error Invalid: lock file's @rolldown/binding-darwin-x64@1.0.0-beta.45 does not satisfy @rolldown/binding-darwin-x64@1.1.2 168: npm error Invalid: lock file's @rolldown/binding-freebsd-x64@1.0.0-beta.45 does not satisfy @rolldown/binding-freebsd-x64@1.1.2 169: npm error Invalid: lock file's @rolldown/binding-linux-arm-gnueabihf@1.0.0-beta.45 does not satisfy @rolldown/binding-linux-arm-gnueabihf@1.1.2 170: npm error Invalid: lock file's @rolldown/binding-linux-arm64-gnu@1.0.0-beta.45 does not satisfy @rolldown/binding-linux-arm64-gnu@1.1.2 171: npm error Invalid: lock file's @rolldown/binding-linux-arm64-musl@1.0.0-beta.45 does not satisfy @rolldown/binding-linux-arm64-musl@1.1.2 172: npm error Missing: @rolldown/binding-linux-ppc64-gnu@1.1.2 from lock file 173: npm error Missing: @rolldown/binding-linux-s390x-gnu@1.1.2 from lock file 174: npm error Invalid: lock file's @rolldown/binding-linux-x64-gnu@1.0.0-beta.45 does not satisfy @rolldown/binding-linux-x64-gnu@1.1.2 175: npm error Invalid: lock file's @rolldown/binding-linux-x64-musl@1.0.0-beta.45 does not satisfy @rolldown/binding-linux-x64-musl@1.1.2 176: npm error Invalid: lock file's @rolldown/binding-openharmony-arm64@1.0.0-beta.45 does not satisfy @rolldown/binding-openharmony-arm64@1.1.2 177: npm error Invalid: lock file's @rolldown/binding-wasm32-wasi@1.0.0-beta.45 does not satisfy @rolldown/binding-wasm32-wasi@1.1.2 178: npm error Invalid: lock file's @rolldown/binding-win32-arm64-msvc@1.0.0-beta.45 does not satisfy @rolldown/binding-win32-arm64-msvc@1.1.2 179: npm error Invalid: lock file's @rolldown/binding-win32-x64-msvc@1.0.0-beta.45 does not satisfy @rolldown/binding-win32-x64-msvc@1.1.2 180: npm error Invalid: lock file's @rolldown/pluginutils@1.0.0-beta.45 does not satisfy @rolldown/pluginutils@1.0.1 181: npm error Invalid: lock file's @babel/generator@7.29.7 does not satisfy @babel/generator@8.0.0 182: npm error Invalid: lock file's @babel/helper-validator-identifier@7.29.7 does not satisfy @babel/helper-validator-identifier@8.0.2 183: npm error Invalid: lock file's @babel/parser@7.29.7 does not satisfy @babel/parser@8.0.0 184: npm error Invalid: lock file's ast-kit@2.2.0 does not satisfy ast-kit@3.0.0 185: npm error Invalid: lock file's birpc@2.9.0 does not satisfy birpc@4.0.0 186: npm error Invalid: lock file's dts-resolver@2.1.3 does not satisfy dts-resolver@3.0.0 187: npm error Invalid: lock file's get-tsconfig@4.14.0 does not satisfy get-tsconfig@5.0.0-beta.5 188: npm error Invalid: lock file's @babel/types@7.29.7 does not satisfy @babel/types@8.0.0 189: npm error Missing: @types/jsesc@2.5.1 from lock file 190: npm error Invalid: lock file's @babel/helper-string-parser@7.29.7 does not satisfy @babel/helper-string-parser@8.0.0 191: npm error Missing: estree-walker@3.0.3 from lock file 192: npm error Missing: @types/estree@1.0.9 from lock file 193: npm error 194: npm error Clean install a project 195: npm error 196: npm error Usage: 197: npm error npm ci 198: npm error 199: npm error Options: 200: npm error [--install-strategy <hoisted|nested|shallow|linked>] [--legacy-bundling] 201: npm error [--global-style] [--omit <dev|optional|peer> [--omit <dev|optional|peer> ...]] 202: npm error [--include <prod|dev|optional|peer> [--include <prod|dev|optional|peer> ...]] 203: npm error [--strict-peer-deps] [--foreground-scripts] [--ignore-scripts] [--no-audit] 204: npm error [--no-bin-links] [--no-fund] [--dry-run] 205: npm error [-w|--workspace <workspace-name> [-w|--workspace <workspace-name> ...]] 206: npm error [-ws|--workspaces] [--include-workspace-root] [--install-links] 207: npm error 208: npm error aliases: clean-install, ic, install-clean, isntall-clean 209: npm error 210: npm error Run "npm help ci" for more info 211: npm error A complete log of this run can be found in: /home/runner/.npm/_logs/2026-06-22T21_45_16_049Z-debug-0.log 212: ##[error]Process completed with exit code 1. 213: Post job cleanup.