Add undefined check for instance methods #3656
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| if (methods[key] != null) { | ||
| vm[key] = bind(methods[key], vm) | ||
| } else { | ||
| warn(`The method ${key} on vue instance is undefined.`, vm) |
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can we add else if (process.env.NODE_ENV !== 'production') here so that the warning can be stripped?
zzz6519003
reviewed
Nov 18, 2016
| if (methods[key] != null) { | ||
| vm[key] = bind(methods[key], vm) | ||
| } else if (process.env.NODE_ENV !== 'production') { | ||
| warn(`The method ${key} on vue instance is undefined.`, vm) |
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curious why do you provide vm as a second variable? it will log vm?
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it's used to get the component name, if available:
https://github.com/vuejs/vue/blob/dev/src/core/util/debug.js#L10-L13
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Ahh I get it, You saved me!!!!!!!!!!
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Adding an undefined property to
methodson vue components leads to a very ambiguous error message:Uncaught TypeError: Cannot read property 'length' of undefinedExample:
It's an easy mistake to make. This checks for undefined properties and warns if it finds one.