Function resolveModifiers

packages/compiler-dom/src/transforms/vOn.ts:33–90

(
  key: ExpressionNode,
  modifiers: SimpleExpressionNode[],
  context: TransformContext,
  loc: SourceLocation,
)

const isKeyboardEvent = /*@__PURE__*/ makeMap(`onkeyup,onkeydown,onkeypress`)

const resolveModifiers = (
  key: ExpressionNode,
  modifiers: SimpleExpressionNode[],
  context: TransformContext,
  loc: SourceLocation,
) => {
  const keyModifiers = []
  const nonKeyModifiers = []
  const eventOptionModifiers = []

  for (let i = 0; i < modifiers.length; i++) {
    const modifier = modifiers[i].content

    if (
      __COMPAT__ &&
      modifier === 'native' &&
      checkCompatEnabled(
        CompilerDeprecationTypes.COMPILER_V_ON_NATIVE,
        context,
        loc,
      )
    ) {
      eventOptionModifiers.push(modifier)
    } else if (isEventOptionModifier(modifier)) {
      // eventOptionModifiers: modifiers for addEventListener() options,
      // e.g. .passive & .capture
      eventOptionModifiers.push(modifier)
    } else {
      // runtimeModifiers: modifiers that needs runtime guards
      if (maybeKeyModifier(modifier)) {
        if (isStaticExp(key)) {
          if (
            isKeyboardEvent((key as SimpleExpressionNode).content.toLowerCase())
          ) {
            keyModifiers.push(modifier)
          } else {
            nonKeyModifiers.push(modifier)
          }
        } else {
          keyModifiers.push(modifier)
          nonKeyModifiers.push(modifier)
        }
      } else {
        if (isNonKeyModifier(modifier)) {
          nonKeyModifiers.push(modifier)
        } else {
          keyModifiers.push(modifier)
        }
      }
    }
  }

  return {
    keyModifiers,
    nonKeyModifiers,
    eventOptionModifiers,
  }
}