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fs: Accept a function as an options container. #1998

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fs: Accept a function as an options container. #1998

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6 changes: 4 additions & 2 deletions lib/fs.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1619,7 +1619,8 @@ function ReadStream(path, options) {
options = {};
else if (typeof options === 'string')
options = { encoding: options };
else if (options === null || typeof options !== 'object')
else if (options === null ||
typeof options !== 'object' && typeof options !== 'function')
throw new TypeError('options must be a string or an object');

// a little bit bigger buffer and water marks by default
Expand Down Expand Up @@ -1790,7 +1791,8 @@ function WriteStream(path, options) {
options = {};
else if (typeof options === 'string')
options = { encoding: options };
else if (options === null || typeof options !== 'object')
else if (options === null ||
typeof options !== 'object' && typeof options !== 'function')
throw new TypeError('options must be a string or an object');

options = Object.create(options);
Expand Down