diff options
Diffstat (limited to 'deps/npm/node_modules/is-callable/index.js')
-rw-r--r-- | deps/npm/node_modules/is-callable/index.js | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/deps/npm/node_modules/is-callable/index.js b/deps/npm/node_modules/is-callable/index.js new file mode 100644 index 0000000000..d9820b51fd --- /dev/null +++ b/deps/npm/node_modules/is-callable/index.js @@ -0,0 +1,37 @@ +'use strict'; + +var fnToStr = Function.prototype.toString; + +var constructorRegex = /^\s*class\b/; +var isES6ClassFn = function isES6ClassFunction(value) { + try { + var fnStr = fnToStr.call(value); + return constructorRegex.test(fnStr); + } catch (e) { + return false; // not a function + } +}; + +var tryFunctionObject = function tryFunctionToStr(value) { + try { + if (isES6ClassFn(value)) { return false; } + fnToStr.call(value); + return true; + } catch (e) { + return false; + } +}; +var toStr = Object.prototype.toString; +var fnClass = '[object Function]'; +var genClass = '[object GeneratorFunction]'; +var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol'; + +module.exports = function isCallable(value) { + if (!value) { return false; } + if (typeof value !== 'function' && typeof value !== 'object') { return false; } + if (typeof value === 'function' && !value.prototype) { return true; } + if (hasToStringTag) { return tryFunctionObject(value); } + if (isES6ClassFn(value)) { return false; } + var strClass = toStr.call(value); + return strClass === fnClass || strClass === genClass; +}; |