envChain_subscript.jsm

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const target = {};

Services.scriptloader.loadSubScript(`data:,

var qualified = 10;

unqualified = 20;

let lexical = 30;

this.prop = 40;

const funcs = Cu.getJSTestingFunctions();

const envs = [];

let env = funcs.getInnerMostEnvironmentObject();

while (env) {

  envs.push({

    type: funcs.getEnvironmentObjectType(env) || "*BackstagePass*",

    qualified: !!Object.getOwnPropertyDescriptor(env, "qualified"),

    unqualified: !!Object.getOwnPropertyDescriptor(env, "unqualified"),

    lexical: !!Object.getOwnPropertyDescriptor(env, "lexical"),

    prop: !!Object.getOwnPropertyDescriptor(env, "prop"),

});

  env = funcs.getEnclosingEnvironmentObject(env);

this.ENVS = envs;

`, target);

const envs = target.ENVS;

const EXPORTED_SYMBOLS = ["envs"];