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Advanced JSSG topics for source transforms and read-only miners. Pick the page that matches what you need.

Transform APIs

Export contract, dynamic parsing, parser-backed edits, selectors, and rule composition.

Workflow Context

Parameters, matrix values, shared state, and runtime hooks.

Multi-File and Multi-Repo

jssgTransform, file rename, and multi-repo orchestration.

Performance

Performant codemods: no-op first, token gates, once-per-scan indexes, wall-clock checks.

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Relocated sections

Fragment links that previously pointed at this page now land here:

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Transform Function Contract

See Transform APIs.

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Dynamic Parsing

See Transform APIs → Dynamic Parsing.

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Parser-Backed Edits

See Transform APIs → Parser-Backed Edits.

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Selectors (getSelector)

See Transform APIs → Selectors.

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Advanced Pattern Composition

See Transform APIs → Advanced Pattern Composition.

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Parameters and Configuration

See Workflow Context → Parameters and Configuration.

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Matrix Strategy Integration

See Workflow Context → Matrix Strategy Integration.

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State Management

See Workflow Context → State Management.

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Runtime Hooks

See Workflow Context → Runtime Hooks.

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Multi-Repo Orchestration

See Multi-File and Multi-Repo → Multi-Repo Orchestration.

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Multi-File Transforms

See Multi-File and Multi-Repo → Multi-File Transforms.

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Best Practices

See Performance → Best Practices.

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Performant codemods

See Performance → Performant codemods.