JAKARTA - Indonesian workers launched protests in several cities on Tuesday to oppose the passage a day earlier of a controversial new jobs law that the government says is vital to attract investment but critics view as too pro-business.

Parliament passed into law President Joko Widodo’s “omnibus” Job Creation bill late on Monday, revising over 70 existing laws to speed up economic reform and improve the investment climate in Southeast Asia’s largest economy.

Still, parliament voted on the bill earlier than expected and ahead of a national strike due to start on Tuesday that unions expect to involve two million workers.

“The law will definitely affect the status of our employment,” Anwar Sanusi, a member of FSPMI trade union in the city of Tangerang west of Jakarta, said by telephone.

Sanusi said the bill would mean outsourced workers and contracted workers remain in place for life, adding that 400 workers on the morning shift had stopped working.

The new law removes the three-year maximum duration of contracts and cuts severance benefits, provisions the government said were intended to promote formal hiring.

Nining Elitos, chairwoman of labour group KASBI, said by text message that "tens of thousands of people had stood in front of factories in many places."

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Her claim could not immediately be verified and it was unclear if workers would be able to protest in front of the parliament building in Jakarta, as planned, as police sought to block protesters on the grounds of containing the coronavirus.

Usman Hamid of Amnesty International Indonesia said this "catastrophic law...will harm workers' wallets, job security and their human rights as a whole."

But Trimegah Securities economist Fakhrul Fulvian said the passage of the bill helped local markets with Jakarta's main stock index JKSE up as much as 1.31 per cent and the rupiah by as much as 1.28 per cent.

He said banks and export-oriented industries should benefit, while consumer and retail sectors may be pressured as workers may increase savings to compensate for changes in labour rules.