src/vs/editor/common/languages/supports/characterPair.ts/CharacterPairSupport/constructor
class CharacterPairSupport:	constructor(config: LanguageConfiguration) {
		if (config.autoClosingPairs) {
			this._autoClosingPairs = config.autoClosingPairs.map(el => new StandardAutoClosingPairConditional(el));
		} else if (config.brackets) {
			this._autoClosingPairs = config.brackets.map(b => new StandardAutoClosingPairConditional({ open: b[0], close: b[1] }));
		} else {
			this._autoClosingPairs = [];
		}

		if (config.__electricCharacterSupport && config.__electricCharacterSupport.docComment) {
			const docComment = config.__electricCharacterSupport.docComment;
			// IDocComment is legacy, only partially supported
			this._autoClosingPairs.push(new StandardAutoClosingPairConditional({ open: docComment.open, close: docComment.close || '' }));
		}

		this._autoCloseBefore = typeof config.autoCloseBefore === 'string' ? config.autoCloseBefore : CharacterPairSupport.DEFAULT_AUTOCLOSE_BEFORE_LANGUAGE_DEFINED;

		this._surroundingPairs = config.surroundingPairs || this._autoClosingPairs;
	}