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Strict Mode ↔ opt-in variant of JS with more restrictive Semantic & rules for JS Compiler

References​

  1. "use strict" ↔ Directive Statement to invoke Strict Mode for either entire script or specific function

  2. with ↔ JS Keyword to extend Scope Chain of Statement . !Forbidden in Strict Mode!

  3. Sloppy Mode ↔ (default) non-Strict Mode Semantics for JS Compiler

  4. this Function Call ↔ 👉 <undefined\> (in Strict Mode; Sloppy Mode 👉 window)

  5. --alwaysStrict ↔ to flag TSC to apply Strict Mode

  6. "alwaysStrict": true ↔ to turn on Strict Mode