noPrecisionLoss

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Diagnostic Category: lint/correctness/noPrecisionLoss

JavaScript (and super languages)

Since: v1.0.0

Sources:

Same as: no-loss-of-precision
Same as: @typescript-eslint/no-loss-of-precision
Same as: lossy_float_literal

Disallow literal numbers that lose precision

Examples

Invalid

const x = 9007199254740993

code-block.js:1:11 lint/correctness/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ This number literal will lose precision at runtime.
  
  > 1 │ const x = 9007199254740993
      │           ^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 9007199254740992

const x = 5.123000000000000000000000000001

code-block.js:1:11 lint/correctness/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ This number literal will lose precision at runtime.
  
  > 1 │ const x = 5.123000000000000000000000000001
      │           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 5.123

const x = 0x20000000000001

code-block.js:1:11 lint/correctness/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ This number literal will lose precision at runtime.
  
  > 1 │ const x = 0x20000000000001
      │           ^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 9007199254740992

const x = 0x2_000000000_0001;

code-block.js:1:11 lint/correctness/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ This number literal will lose precision at runtime.
  
  > 1 │ const x = 0x2_000000000_0001;
      │           ^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 9007199254740992

Valid

const x = 12345
const x = 123.456
const x = 123e34
const x = 12300000000000000000000000
const x = 0x1FFFFFFFFFFFFF
const x = 9007199254740991
const x = 9007_1992547409_91

noPrecisionLoss

Examples

Invalid

Valid

Related links