Mark Marpit's options member as immutable #46
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We use
optionsmember of Marpit to store the initial options. Some several plugins have used this value directly because of supporting the change of value.But actually, we have mixed the usage of options. For example,
backgroundSyntaxandfilteroption cannot apply the change ofoptionsvalue that makes after creating instance.With this PR, we will mark
optionsas immutable. To be specific, theoptionsproperty ofMarpitis defined byObject.defineProperty()withoutwritable, and options object is frozen byObject.freeze().Also we added the JSDoc document and TypeScript definition.