Summary

Adds Script.declareVersion(coder, name) to register versioned type output by name/version and extends contents() to emit a Versions type alias representing that nested map.

Follow-up review feedback is incorporated:

• declareVersion now reads coder.version directly (no optional version cast/check).

• Versions entries are derived from generated version code only (no typeDeclaration fallback).

• Version registry in Script

  • Added internal versions: Map<string, Map<string, ExportStatement>>.
  • Implemented declareVersion(coder, name) with duplicate protection per (name, version) key.

• Version declarations included in generation lifecycle

  • Extended isInProgress() / finished() to track version declaration promises.
  • Ensured contents() awaits completion before formatting.

• Versions type emission

  • Added versionsTypeStatements() and integrated it into contents() output.
  • Emits a type alias shaped as map-of-maps of generated versioned types.

script.declareVersion(new V1AccountTypeCoder({}), "Account");
script.declareVersion(new V2AccountTypeCoder({}), "Account");

// generated
export type Versions = {
  Account: {
    "1.0.0": { id: string };
    "2.0.0": { id: string; email: string };
  };
};

Manual acceptance tests

• Declaring two coders with the same name and different coder.version values emits both entries under that name in Versions.
• Calling contents() after declareVersion(...) includes an export type Versions = ... declaration in generated output.
• Re-declaring the same (name, version) pair does not create duplicate version entries.
• Versions values are emitted from the declared version code (not from typeDeclaration).
• Existing import/export statement generation remains unchanged when no versions are declared.

Tasks

• Added versions state to Script and implemented declareVersion(coder, name).
• Wired version declaration promises into script completion tracking (isInProgress, finished).
• Added versionsTypeStatements() and injected Versions emission into contents().
• Added focused unit tests in test/typescript-generator/script.test.ts for version grouping and contents() output.
• Applied review feedback to use coder.version directly and remove typeDeclaration usage from version declaration output.