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Severity: error
Category: control-flow
Stage: Stage 1

Description

SJS always runs in strict mode. The with statement is unconditionally banned by the ECMAScript strict mode specification (ECMA-262 §13.11). with alters the scope chain at runtime in ways that cannot be statically analysed, making type-checking and tooling impossible.

The parser rejects any with statement before type-checking begins.

Example

// ✗ error
const obj = { x: 1, y: 2 }

with (obj) {    // SJS-E013
  console.log(x + y)
}

Fix

Access properties explicitly:

// ✓ correct
const obj = { x: 1, y: 2 }
console.log(obj.x + obj.y)

Or destructure when many members are needed in a local block:

// ✓ correct — destructure
const { x, y } = obj
console.log(x + y)

Related codes

  • SJS-E012 — namespace is also banned for similar static-analysis reasons
Documentation