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Diffstat (limited to 'docs/code-quality/lint/linters/eslint-plugin-mozilla/no-throw-cr-literal.rst')
-rw-r--r-- | docs/code-quality/lint/linters/eslint-plugin-mozilla/no-throw-cr-literal.rst | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/docs/code-quality/lint/linters/eslint-plugin-mozilla/no-throw-cr-literal.rst b/docs/code-quality/lint/linters/eslint-plugin-mozilla/no-throw-cr-literal.rst new file mode 100644 index 0000000000..ce73c72b36 --- /dev/null +++ b/docs/code-quality/lint/linters/eslint-plugin-mozilla/no-throw-cr-literal.rst @@ -0,0 +1,39 @@ +=================== +no-throw-cr-literal +=================== + +This is similar to the ESLint built-in rule no-throw-literal. It disallows +throwing Components.results code directly. + +Throwing bare literals is inferior to throwing Exception objects, which provide +stack information. Cr.ERRORs should be be passed as the second argument to +``Components.Exception()`` to create an Exception object with stack info, and +the correct result property corresponding to the NS_ERROR that other code +expects. +Using a regular ``new Error()`` to wrap just turns it into a string and doesn't +set the result property, so the errors can't be recognised. + +This option can be autofixed (``--fix``). + +.. code-block:: js + + performance.timing.navigationStart + performance.now() + +Often timing relative to the page load is adequate and that conversion may not +be necessary. + +Examples of incorrect code for this rule: +----------------------------------------- + +.. code-block:: js + + throw Cr.NS_ERROR_UNEXPECTED; + throw Components.results.NS_ERROR_ABORT; + throw new Error(Cr.NS_ERROR_NO_INTERFACE); + +Examples of correct code for this rule: +--------------------------------------- + +.. code-block:: js + + throw Components.Exception("Not implemented", Cr.NS_ERROR_NOT_IMPLEMENTED); |