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A static check that values are used in ways their declared types allow.
Type checks catch mismatched data shapes before code runs. In TypeScript, they are one of the best defenses against agent-generated code that looks plausible but passes the wrong object.
Plainly
Think of Type Check as a tool from the builder toolbox. A static check that values are used in ways their declared types allow.
In practice
Use it when you are installing, editing, testing, reviewing, or shipping code. In practice, define the owner, input, output, and failure mode before you rely on it.