Lint Rules

useYield (since vnext)

Require generator functions to contain yield.

This rule generates warnings for generator functions that do not have the yield keyword.

Source: require-await.

Examples

Invalid

function* foo() {
  return 10;
}
nursery/useYield.js:1:1 lint/nursery/useYield ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

   This generator function doesn't contain yield.
  
  > 1 │ function* foo() {
   ^^^^^^^^^^^^^^^^^
  > 2 │   return 10;
  > 3 │ }
   ^
    4 │ 
  

Valid

function* foo() {
  yield 5;
  return 10;
}

function foo() {
  return 10;
}

// This rule does not warn on empty generator functions.
function* foo() { }