Document Source Text repeat() shorthand

[ivg-design]

Summary

• explain that Source Text values can use standard JavaScript String methods when the JavaScript expression engine is active
• document the receiver-less repeat(count) form alongside explicit value.repeat(count) and text.sourceText.repeat(count) examples
• clarify that repeat() is not a global After Effects method and is undefined as a bare call on numeric properties

Why

After Effects treats Source Text as a JavaScript string and resolves supported instance methods against the current property. This makes repeat(3) valid in a Source Text expression even though the same unqualified call is not defined on a numeric property.

The method itself is the standard ES2015 String.prototype.repeat() method; this change documents the After Effects-specific context in which its receiver can be omitted without presenting it as a new After Effects global or a TextDocument API.

Verification

• AE 27.0x8 Beta, JavaScript expression engine:
  • repeat(3), value.repeat(3), and text.sourceText.repeat(3) on Source Text each returned the expected repeated text with an empty expressionError
  • bare repeat(3) on a Slider reported ReferenceError: repeat is not defined
  • explicit "X".repeat(3) remained available on the Slider expression
• mkdocs build --strict

[ivg-design]

Replaced by #10 to use the requested source branch name without the codex/ prefix.