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Add explanations for scripts' different error fields #5351

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Mar 13, 2020
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Add explanations for scripts' different error fields #5351

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Add explanations for scripts' different error fields
domenic Mar 12, 2020
d8934f2
No "should" in notes
domenic Mar 12, 2020
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21 changes: 16 additions & 5 deletions source
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Original file line number Diff line number Diff line change
Expand Up @@ -89120,12 +89120,18 @@ interface <dfn>ApplicationCache</dfn> : <span>EventTarget</span> {
script">module scripts</span>; or null. In the former two cases, it represents a parsed script;
null represents a failure parsing.</p></dd>

<dt>A <dfn data-dfn-for="script" data-export="" data-x="concept-script-parse-error">parse
error</dfn></dt>
<dt>A <dfn data-dfn-for="script" data-x="concept-script-parse-error">parse error</dfn></dt>

<dd><p>A JavaScript value, which has meaning only if the <span
data-x="concept-script-record">record</span> is null, indicating that the corresponding script
source text could not be parsed.</p></dd>
<dd>
<p>A JavaScript value, which has meaning only if the <span
data-x="concept-script-record">record</span> is null, indicating that the corresponding script
source text could not be parsed.</p>

<p class="note">This value is used for internal tracking of immediate parse errors when <a
href="#creating-scripts">creating scripts</a>, and is not to be used directly. Instead, consult
the <span data-x="concept-script-error-to-rethrow">error to rethrow</span> when determining
"what went wrong" for this script.</p>
</dd>

<dt>An <dfn data-dfn-for="script" data-export="" data-x="concept-script-error-to-rethrow">error
to rethrow</dfn></dt>
Expand All @@ -89134,6 +89140,11 @@ interface <dfn>ApplicationCache</dfn> : <span>EventTarget</span> {
<p>A JavaScript value representing an error that will prevent evaluation from succeeding. It
will be re-thrown by any attempts to <a href="#calling-scripts">run</a> the script.</p>

<p class="note">This could be the script's <span data-x="concept-script-parse-error">parse
error</span>, but in the case of a <span>module script</span> it could instead be the
<span data-x="concept-script-parse-error">parse error</span> from one of its dependencies, or
an error from <span>resolve a module specifier</span>.</p>

<p class="note">Since this exception value is provided by the JavaScript specification, we know
that it is never null, so we use null to signal that no error has occurred.</p>
</dd>
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