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New: func-call-spacing rule (fixes #6080)
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# require or disallow spacing between `function` identifiers and their invocations (func-call-spacing) | ||
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(fixable) The `--fix` option on the [command line](../user-guide/command-line-interface#fix) automatically fixes problems reported by this rule. | ||
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When calling a function, developers may insert optional whitespace between the function's name and the parentheses that invoke it. The following pairs of function calls are equivalent: | ||
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```js | ||
alert('Hello'); | ||
alert ('Hello'); | ||
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console.log(42); | ||
console.log (42); | ||
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new Date(); | ||
new Date (); | ||
``` | ||
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## Rule Details | ||
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This rule requires or disallows spaces between the function name and the opening parenthesis that calls it. | ||
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## options | ||
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This rule has one string option: | ||
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- `"never"` (default) disallows space between the function name and the opening parenthesis | ||
- `"always"` requires space between the function name and the opening parenthesis | ||
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### never | ||
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Examples of **incorrect** code for this rule with the default `"never"` option: | ||
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```js | ||
/*eslint func-call-spacing: ["error", "never"]*/ | ||
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fn (); | ||
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fn | ||
(); | ||
``` | ||
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Examples of **correct** code for this rule with the default `"never"` option: | ||
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```js | ||
/*eslint func-call-spacing: ["error", "never"]*/ | ||
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fn(); | ||
``` | ||
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### never | ||
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Examples of **incorrect** code for this rule with the `"always"` option: | ||
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```js | ||
/*eslint func-call-spacing: ["error", "always"]*/ | ||
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fn(); | ||
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fn | ||
(); | ||
``` | ||
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Examples of **correct** code for this rule with the `"always"` option: | ||
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```js | ||
/*eslint func-call-spacing: ["error", "always"]*/ | ||
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fn (); | ||
``` | ||
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## When Not To Use It | ||
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This rule can safely be turned off if your project does not care about enforcing a consistent style for spacing within function calls. | ||
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## Related Rules | ||
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- [no-spaced-func](no-spaced-func.md) (deprecated) |
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/** | ||
* @fileoverview Rule to control spacing within function calls | ||
* @author Matt DuVall <http://www.mattduvall.com> | ||
*/ | ||
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"use strict"; | ||
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//------------------------------------------------------------------------------ | ||
// Rule Definition | ||
//------------------------------------------------------------------------------ | ||
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module.exports = { | ||
meta: { | ||
docs: { | ||
description: "require or disallow spacing between `function` identifiers and their invocations", | ||
category: "Stylistic Issues", | ||
recommended: false | ||
}, | ||
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fixable: "whitespace", | ||
schema: [ | ||
{ | ||
enum: ["always", "never"] | ||
} | ||
] | ||
}, | ||
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create: function(context) { | ||
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var never = context.options[0] !== "always", | ||
sourceCode = context.getSourceCode(); | ||
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/** | ||
* Check if open space is present in a function name | ||
* @param {ASTNode} node node to evaluate | ||
* @returns {void} | ||
* @private | ||
*/ | ||
function checkSpacing(node) { | ||
var lastCalleeToken = sourceCode.getLastToken(node.callee), | ||
prevToken = lastCalleeToken, | ||
parenToken = sourceCode.getTokenAfter(lastCalleeToken), | ||
hasWhitespace; | ||
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// advances to an open parenthesis. | ||
while ( | ||
parenToken && | ||
parenToken.range[1] < node.range[1] && | ||
parenToken.value !== "(" | ||
) { | ||
prevToken = parenToken; | ||
parenToken = sourceCode.getTokenAfter(parenToken); | ||
} | ||
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// Parens in NewExpression are optional | ||
if (!(parenToken && parenToken.range[1] < node.range[1])) { | ||
return; | ||
} | ||
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hasWhitespace = sourceCode.isSpaceBetweenTokens(prevToken, parenToken); | ||
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if (never && hasWhitespace) { | ||
context.report({ | ||
node: node, | ||
loc: lastCalleeToken.loc.start, | ||
message: "Unexpected space between function name and paren.", | ||
fix: function(fixer) { | ||
return fixer.removeRange([prevToken.range[1], parenToken.range[0]]); | ||
} | ||
}); | ||
} else if (!never && !hasWhitespace) { | ||
context.report({ | ||
node: node, | ||
loc: lastCalleeToken.loc.start, | ||
message: "Missing space between function name and paren.", | ||
fix: function(fixer) { | ||
return fixer.insertTextBefore(parenToken, " "); | ||
} | ||
}); | ||
} | ||
} | ||
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return { | ||
CallExpression: checkSpacing, | ||
NewExpression: checkSpacing | ||
}; | ||
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} | ||
}; |
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