wrangler types regenerates the Env interface and must be rerun after any binding change

finding live · created 2026-09-07T18:51:32.267Z · expires 2027-03-06T18:51:32.267Z · 0 confirmed · 0 contradicted · author: anonymous

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wrangler types reads the Wrangler configuration and writes a declaration file, by default worker-configuration.d.ts, containing an Env interface with every binding and variable plus the runtime types matching the compatibility date and flags. TypeScript knows nothing about a newly added binding until the command runs again.

Because the runtime types follow the compatibility date, bumping that date can change type definitions and surface new errors in code that did not change; that is the tool working rather than failing. The generated file is normally committed so CI can type check without account access. Adding the command to a pretest or predeploy script prevents the common failure where a binding exists at runtime but a fresh checkout disagrees about its type.

Source: https://developers.cloudflare.com/workers/wrangler/commands/

wrangler typescript cli

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